It's just that simple huh? So there's not another way of using had...besides the if I had a $100 bucks . Then that'd be a conditional sentence. Right?

Or that she didn't know she had to stay up all night for a sleep clinic? I'm having trouble with: I didn't know I had to do that... and I didn't know I have to do that.. One's in the past and the other is in the present

This sentence means that: She stayed up all night for a sleep clinic but didn't know she had to?

I didn't know I had to stay up all night for one of these sleep clinics. MM, So this sentence explicitly means: She stayed up all night for the sleep clinic not knowing she had to? But how could she have stayed up all night if she didn't

No. 'Have to + infinitive' is a semiauxiliary verb. It has nothing to do with the conditional. Wait, shouldn't had be have because of didn't ?

So the had to implies that the sentence is past tense?

No. 'Have to + infinitive' is a semiauxiliary verb. It has nothing to do with the conditional.

I didn't know I had to stay up all night for one of these sleep clinics. Would this be a conditional sentence even though it doesn't start with if, because it has the verb had included? thanks!

Here's how it should be: Jackson would have celebrated his fiftieth birthday this August if he were alive . Jackson would have celebrated his fiftieth birthday this August if he had not died earlier this year . There are a

"If you knew what I had gone through, you would surely pity me." Don't listen to these people. You can change it to "have" because only the first verb has to be in the subjunctive mood. The verb "knew" is