were formed after the reaction vs have been formed after the reaction

Both phrases are correct, but they are used in different contexts. 'Were formed after the reaction' is used to describe a past event that happened after the reaction took place. 'Have been formed after the reaction' is used to emphasize the completion of the formation process after the reaction, with a focus on the present result.

Last updated: April 01, 2024 • 594 views

This phrase is correct and commonly used to describe a past event that occurred after the reaction.

"were formed after the reaction"

This phrase is used to indicate that something was created or came into existence following a reaction that happened in the past.

Show examples from the web [+]

evidence that the reaction products of the contaminant, formed after the performance of the detoxification process, do not endanger animal and public health and the environment;
Poland, a country that itself was once knocking on the EU's door, is now calling for the opportunity of membership to be offered to Ukraine and other countries that were formed after the collapse of the USSR.
According to a legend, the Plitvice lakes were formed after a major drought, when people, animals and plants were longing for water.
Te present-day town square was formed after the castle was destroyed in 1808.
People think these holes were all formed after the last ice age.
This system allows to eliminate the excess material formed after the welding of the profile.
The planets that have been found... must have formed after the supernova explosion.
The high therapeutic value of this association, the only of its kind in Europe, is due to the quality of the extracted sea mud, rich in organic iodine and zinc, that were formed after centuries of saltpan activity.
SIEF A forum, formed after the pre-registration phase, to share data on a given phase-in substance.
The inner pit with the new lava lake formed after the 2002 lateral eruption (fisheye lens).
They're what's left over from the creation of the solar system after the planets were formed billions of years ago.
Even after the earthquake Kobe Ban spoke in 1995 designing fifty houses for the displaced Vietnamese. The bases were formed from beer crates full of sand thus avoiding concrete foundations.
Legend has it that the lakes were formed after a huge meteorite fall, and its mysterious waters are able to heal. It is believed that the man who swims in all five lakes enjoy health and wealth.
Even though a new government has been formed after the recent parliamentary elections, responsibility for environmental matters remains with the combined Ministry for the Environment, Physical Planning and Public Works.
A positive signal today will give the new Slovenian Government which is to be formed after the 10 November elections even more encouragement to meet future challenges, especially in the framework of the national accession strategy, with equal success.
5. This Article shall apply mutatis mutandis to undertakings formed after the date of notification of this Directive which take over business already conducted on that date by a legally distinct body.
The European air transport sector was made to suffer disruptions for over a week as a result of the cloud of ash formed after the volcanic eruption in Iceland.
The company has expressed the auspice that the new Greek government, that he will be formed after the elections of next Sunday, resolves the problem in its entirety.
When a Premonstratensian left the monastery to follow the Czech National Church formed after the separation from Rome which had just occurred, Jakob Kern discovered his vocation in this sad event.
As you know, after the big bang, in space there were only hydrogen and helium. It was in the stars that all the remaining chemical elements were formed.

Alternatives:

were created after the reaction
formed after the reaction

This phrase is also correct and is used to emphasize the completion of the formation process after the reaction, with a focus on the present result.

"have been formed after the reaction"

This phrase is used to highlight that something has completed the process of being formed after a reaction, emphasizing the current state or result.

Show examples from the web [+]

The earth is said to have been formed about 400 million after the sun formed, ie 4.6 billion years ago.
Even though a new government has been formed after the recent parliamentary elections, responsibility for environmental matters remains with the combined Ministry for the Environment, Physical Planning and Public Works.
Many voluntary organizations have been formed and is working to reduce the mortality of aquatic mammals in the network.
In response to this call, groups of specialists from various countries have been formed.
A new government would have been formed, led by former MP María Corina Machado.
Civil defence teams have been formed in every town with a population over 5,000.
At 500 million years old, all of the Solar System's planets have been formed.
Where groupings have been formed - frequently cross-border organizations dealing in goods and services - they have shown that the concept works.
Aroma compounds in garlic and onions help protect them from bacterial and viral infections and certain enzyme blockers have been formed to fight toxic pollutants.
For a thousand years Sweden's history and culture have been formed by the Gospel.
Governments and businesses continually update their strategies to prevent attacks, and public-private partnerships have been formed to develop voluntary, market-based approaches to security.
From 1980 to 19875000 agent have been formed, rural midwifes, technicians and superior health techniciansfor obstetric help.
Of the metabolites found in urine only about 1% have been formed through oxidation.
Worldwide organizations and associations have been formed because of this book and its message, many of them existing for centuries.
The main problems were due to the lighting system which should have been formed of a uniformly illuminated circular surface.
The stacks have been formed by erosion, and are varying heights and thicknesses.
Under the pretext of the Holocaust, a very strong polarization has taken place in the world and fronts have been formed.
Thousands of people from different cultures and religions have been formed in this place, thanks to summer courses and formation seminars promoted by the movement.
The modder also modified the diplomatic alignments among the 8 countries that have been formed in this way.
As you know, so-called National Guards have been formed in these countries and are tolerated by the State authorities.

Alternatives:

have been created after the reaction
have formed after the reaction

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were formed after the reaction vs have been formed after the reaction