Now let's go into Tenses

If this had happened to you, what ____?

A) would you do
B) have you done
C) would you have done
D) will you do
E) would you doing

Tenses refers to the relationship between an action and the time of its execution.

Present tense - go, is, am, has/have

Past tense - went, was, were, had

Past participle - This can be in various forms

en e.g beat - beaten
ed e.g walk - walked
unchanged e.g hit - hit
changed e.g - seek - sought

Future Tense

This is the tense carrying modal auxiliaries and lexical verbs

Will and Shall are the modal auxiliaries used especially for indicating future actions.

Only I and We can however be used with shall, while he, she, it, you, they cannot be used with Shall

Rule guiding Tenses

When as if is used, the following verb should be in past form

He walks as if he were a king (not is)

Rule 2

When supposed is used, the expression is

Subject + primary auxiliary+ supposed

Example
John is supposed to

John - subject
Primary auxiliary - is

Not:
John supposed to

Rule 3

When has, have or had is used, you should not indicate any definite time when the action was performed

He went yesterday (Correct)

He has gone yesterday (wrong)

But if you wish to use any of has/have/had with the time of action you must put for or since before the time indicated

Example
He has gone since five o'clock

He has gone for three hours

Rule 4

When has/have/had is used, the verb that follows it must be a past participle one

He has eaten, not: He has ate

We have written our notes, not: We have write

Rule 5
When mind, minded, help, like, being kept, etc are used

I couldn't help laugh + ing yesterday

Not: I couldn't help to laugh yesterday

We do not mind singing

Not: We do not mind to sing

Rule 6

Wish + Subject+ Past tense verb

I wish I knew you

I wish I were you

Attempt

What a relief that the strike _ when it did.

A.) Would end
B) Was ending
C)ended
D) has ended
E) ending

Did indicates that it was done in the past, so as past tense should be used

It is high time you ____ the market

A. Left
B. Leave
C. Did leave
D. Do leave

Attempt pls

Note:

When high time is used in an expression, the verb to be used is past tense

So, the answer is left

Rule 7

Subject+ happened/seem/appeared+ to have + past participle

They happened to have offended me

Rule 8

After it's time or high time, a past tense verb should be used

It is time Jude went home

It is high time James came back