Question

sentence begining with condition that​

Answer 1

There are some sentence conditions

example

If there is "would have been" in the first clause, the second clause must have "past perfect' tense.

Explanation:

• It's a third type of conditional sentence.
• In the first clause, if there is "would have been" used, the second clause must have a past perfect tense
• Like in the following sentence,  
• There would have been a collapse, if the earthquake had lasted long.

See a similar question here:

Basic rules of grammar

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