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I know that the past of "mus"t is" had to",what about the past of "mustn't",is it" hadn't to" or "didn't have to" ?As far as I know " hadn't to " means there was no obligation to do something.Examples:

I haven't to/I don't have to do my homework = I'm not obliged to do it

I hadn't to do my homework = I wasn't obliged to do it

Are these sentences correct ?
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Comments  (Page 2) 
It comes down to definitions.
What do you mean by "The past tense of X is Y" ?
Are you referring to words, or expressions?

The past tense of "escape" is "got away." (true or false?)
Everlastinghope:

(1) Today when my wife comes home, I must not tell her what the doctor said, because the news would upset her if I told her.

(2) Yesterday when my wife came home, I was obliged not to tell her what the doctor had said, because the news would have upset her if I had told her.
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Ah! Now we're getting somewhere! Emotion: smile
everlastinghopewhat drives me mad is to find one thing in a book ( New Headway),and another thing in some websites.
If you quote the sentences which you believe are contradictory and tell us the source of each (which book, which website), maybe we can give you some insight about how to interpret what you read in those places -- if you wish to pursue the question further.

CJ
Anonymous
2) Yesterday when my wife came home, I was obliged not to tell her what the doctor had said, because the news would have upset her if I had told her.


Yeah,I think I should've asked about another way to express "must" in the past. "I was obliged not to",or "I wasn't allowed to"...etc.

So sorry for annoying you with this question.

Concerning which book,it's "New Headway" which I think it's the British method taught abroad.

Just one more question ;regarding conditional type 2.The structure is the following : If+simple past,would+stem.I think as it is explained by Michael Swan" It's used to talk about unreal or improbable present and future situations".

Example:

1- If I had money,I would travel = I don't have money.

2- If I saw Peter,I would say hello = I won't see him.

What about these two sentences :

1- If you worked hard,you would succeed.

2- If you didn't work,you wouldn't succeed.
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CalifJim
everlastinghopewhat drives me mad is to find one thing in a book ( New Headway),and another thing in some websites.
If you quote the sentences which you believe are contradictory and tell us the source of each (which book, which website), maybe we can give you some insight about how to interpret what you read in those places -- if you wish to pursue the question further.

CJ

I wrote in my last message which website I found that "had to" is the past of "must".Just go back to my previous message.