TextRanch
The best way to perfect your writing.

Discover why 1,062,726 users count on TextRanch to get their English corrected!

1. Input your text below.
2. Get it corrected in a few minutes by our editors.
3. Improve your English!

One of our experts will correct your English.

TextRanch Editors

how long do you know this? vs how long do you know that?

Both phrases are incorrect. The correct form should be 'How long have you known this?' or 'How long have you known that?' The verb 'know' requires the present perfect tense when referring to a period of time that extends up to the present moment.

Last updated: March 25, 2024 • 1023 views

This phrase is incorrect. The verb 'know' should be in the present perfect tense when referring to a period of time extending up to the present moment.

"how long do you know this?"

The correct form is 'How long have you known this?' which indicates a duration of time up to the present moment.
  • How long do you know this already?
  • Your woman, how long do you know her?
  • How long you know about this?
  • How long, do you know?
  • Do you know how long'?
  • So how long did you know Quintana?
  • So how long you know Rick?
  • New lungs work, but for how long, you know?
  • How long do we know eachother?
  • Were they married long, do you know?
  • So, how long did you know Bridgett?
  • do you know how long I wanted this?
  • Tell me, how long do you know the doll?
  • Were they married long, do you know?
  • How long did she know Fletcher?
  • Do you know how long I looked for this?!
  • Do you know how long the testing process takes for medical protocols like this?
  • Do you know how long it takes to render a 3-D image like this?
  • Do you know how long it'll be before you have to deal with this?
  • Do you know how long I've been studying for this?

Alternatives:

  • How long have you known this?

This phrase is incorrect. The verb 'know' should be in the present perfect tense when referring to a period of time extending up to the present moment.

"how long do you know that?"

The correct form is 'How long have you known that?' which indicates a duration of time up to the present moment.
  • Your woman, how long do you know her?
  • How long, do you know?
  • Do you know how long'?
  • How long do you know this already?
  • How long you know about this?
  • So how long did you know Quintana?
  • So how long you know Rick?
  • New lungs work, but for how long, you know?
  • How long do we know eachother?
  • How long has the house been abandoned, do you know that?
  • Were they married long, do you know?
  • So, how long did you know Bridgett?
  • Tell me, how long do you know the doll?
  • Were they married long, do you know?
  • How long did she know Fletcher?
  • Life is long, you know? Live it up.
  • How do you know that?.
  • - How do you know that? - Emily was a redhead.
  • -How do you know that? -Go there all the time.
  • How do you know that? I'm taking Frost's advice.

Alternatives:

  • How long have you known that?

Related Comparisons

How TextRanch works

Fast and reliable proofreading, editing, and language advice tailored to your needs.

1. Choose Your Service

Quick Text Editing

  • Emails and short texts
  • Proofreading & editing
  • Ready in 5-10 minutes
SUBMIT YOUR TEXT NOW

Document Editing

  • Documents of any type (*.docx)
  • Advanced & Premium editing
  • Ready in as little as 4 hours
UPLOAD YOUR DOCUMENT

Ask an Editor

  • Personalized answers to your language questions
  • Expert guidance on grammar, style, and usage
  • Ready in 24 hours
ASK YOUR QUESTION

Upload your document or paste your text directly into our platform. Your text is reviewed and refined by our expert editors (real people, not machines) who understand the nuances of English. Expect corrections, improvements, and insightful suggestions that enhance the clarity, tone, and professionalism of your writing.

In just a few minutes (or hours for longer documents), you'll receive your corrected text. Review the changes, make any final adjustments, and confidently share your polished English with the world.
You can count on a personalized, friendly service every time you use TextRanch. We're committed to helping you make a great impression with every word you write.

We proofread and edit these types of texts and documents:

Short texts Business Emails Personal Emails Social media posts Resume and Curriculum Vitae Business documents Sales proposal Research and academic papers Thesis Dissertation Essays Articles Blog posts and much more....

Powered By Humans

TextRanch Editors

AI is a great tool, but when it comes to perfecting your writing, we rely on real human editors.

  • All our editors are native English speakers.
  • Each editor has passed a rigorous admission test to ensure quality.
  • Our global team is ready to correct any text, anytime.

MEET OUR EDITORS

TextRanch Editors

Why choose TextRanch?

Complete Privacy

Your texts are safe and secure with us. We never share your information with third parties.

Affordable Pricing

No subscription fees and rates up to 50% cheaper than other online editing services.

100% Satisfaction

We guarantee that you'll be satisfied with the quality of our service or your money back.

Top Customer Service

Our team is here to help you with any questions you may have. Contact us anytime.

Our Customers Love Us!

We have an average rating of 4.79 stars based on 283125 votes, and

People Feedback 4.9 Excellent - Reviews 2.137

"7 years without any disappointment. Always 100% satisfied. You guys are the best in the world at what you do. Thank you so much :)"

Profile picture of Zubair from Bangladesh

Zubair
from Bangladesh From

"I wasn't aware of this service, it's fascinating and more reliable than standard IA tools available on the internet"

Profile picture of Arturo from Mexico

Arturo
from Mexico From

"In a world of text messages and online communication, this is great to have as a live tool. Thank you."

Profile picture of Selena from USA

Selena
from USA From

"Wow, it's just so excellent. I never would have believed I could have a sure and excellent English companion. Thanks, TextRanch."

Profile picture of Ifiok from Nigeria

Ifiok
from Nigeria From

"This is my first time using TextRanch, and I like how the editors take time to correct my text. To everyone who has never used TextRanch before, I highly recommend trying it."

Profile picture of Wilson from France

Wilson
from France From

"It is an amazing source of feedback because, as a non-native speaker, I really need to have a reliable helper correct my text."

Profile picture of Susan from Germany

Susan
from Germany From

Trusted by Hundreds Teams

Facebook logo
Accenture logo
Air Asia logo
AirBus logo
Amazon logo
Bayer logo
Decathlon logo
Docusign logo
Ebay logo
Fiverr logo
Fossil logo
Keller Williams logo
LinkedIn logo
Loreal logo
Motorola logo
Orange logo
Roche logo
Salesforce logo
Stellantis logo