Why are they growing so fastb vs Why do they grow so fast

Both phrases are similar in meaning, but the correct one is "Why do they grow so fast?". The use of the auxiliary verb "do" is necessary to form a question in the present simple tense. The other phrase is incorrect due to the missing auxiliary verb.

Last updated: March 24, 2024

Why are they growing so fastb

This phrase is incorrect. It is missing the auxiliary verb "do" to form a question in the present simple tense.

Incorrect construction. The correct form should be "Why do they grow so fast?" to form a question in the present simple tense.

Show examples from the web [+]

This is a photograph flying into Arizona, and when you look at it, you're like, "What are they growing here?" It turns out they're growing lettuce in the middle of the desert using water sprayed on top.
Which is why I'm growing so concerned.
It's growing so fast, and we have so many new converts.
My hair and fingernails... they're growing so fast.
Your powers are growing so quickly, you weren't prepared.
The tumor is growing so fast the doctors don't think that will work.
Just growing so fast it collapsed under its own weight.
You know, we actually had to expand into this office a couple months ago because the company's growing so fast.
And I'm afraid it's going to keep returning until it's demolished growing so large that it will consume everything in its path.
And of course it's growing so fast, sometimes there's growing pains.
What could it be, growing so thick
They're both growing so fast body and mind
And his feet are growing so fast, I've got to buy him runners every four months.
I believe that is the challenge: to have economies that are growing so that we can then spend money on enlightened social policies.
You saying they growing herb in the back of restaurants now?
As a kid, I was growing so fast, for entertainment, my parents used to stand me in the middle of the room and just watch me grow.
Moreover, the photovoltaic market is growing so rapidly that even a slightly different growth pattern for the modules market in the EEA would not deviate such that it would be below 1,76 %.
But what I do know is you're growing so fast, and it terrifies me.
I mean, you're growing so fast.
I have the company, and it's growing so fast. I can't do it all myself, and I need a manager, and you're a perfect candidate.

Why do they grow so fast

This phrase is correct and commonly used in English. It forms a question in the present simple tense.

This phrase is the correct way to ask a question in the present simple tense about the speed of growth.

Show examples from the web [+]

Sometimes firms grow so fast, issues of wage and hour compliance get overlooked.
Rappers, they grow up so fast.
They grow up so fast these days.
They grow up so fast, especially the girls.
So to me, as a public health professor, it's not strange that all these countries grow so fast now.
How did he grow so fast?
Gods, but they grow fast.
They grow up so fast, you know, and...
I wonder why your nails grow so fast?
There is strong evidence that European enterprises suffer from a financing gap, especially if they grow fast or if they are characterised as young firms.
And they're long and they grow fast, like a bolted lettuce.
They grow up so fast these days... he's walking, he's talking, he's even smoking.
They grow up so fast, don't they?
Anyway, they grow up fast, is what I'm saying.
My glands, they grow old too fast.
Trust me... they grow up really fast.
Children these days grow up so fast...
They've had to grow up so fast.
There was no need for you to grow up so fast.
You grow fast and then stop - part of our resilience.

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Why are they growing so fastb vs Why do they grow so fast