Had to / must have + PP

Question

Hello,I´d like to ask you for help. What is the difference between the following sentences, please?:1. It had to be terrible. / It must have been terrible.2. You needn´t have bought so much. / You didn´t have to buy so much.3. I could help you yesterday. / I could have helped you yesterday.Thanks a lot in advance.Luc

GPY · Accepted Answer

lucluc1. It had to have been be terrible. / It must have been terrible.

These can both be used of something that the speaker did not personally experience, to indicate what the speaker believes it was like, based on indirect evidence, general knowledge, etc.

Those poor people hit by the earthquake. It must have been terrible.

"must" is the more common way to say it.

"It had to be terrible" may be understood as a loose or faulty way of saying the same thing. It can also be used to express necessity, e.g. in the case that someone deliberately wanted to make something terrible:

A: That was a terrible French accent.
B: It had to be terrible, otherwise the joke wouldn't have been funny.

lucluc2. You needn´t have bought so much. / You didn´t have to buy so much.

These mean about the same in normal contexts.

Please note that you are using the wrong character for the apostrophe. You are typing an acute accent.

lucluc3. I could help you yesterday. / I could have helped you yesterday.

"I could help you yesterday" is not a totally satisfactory sentence by itself. Most probably it means that the speaker did help the other person. More usually, it would be used in combination with something else, e.g. "I'm so glad (that) I could help you yesterday".

"I could have helped you yesterday" means that it would have been possible, but for some reason actually the speaker didn't help that person:

I could have helped you yesterday -- if only you'd contacted me.

It also can mean that the speaker does not remember whether he did or didn't help that person:

I could have helped you yesterday -- I'm really not certain, since I helped so many people.

Had to / must have + PP

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