Synoniemen: be obliged, be obliged to, must, need, ought to, should, be to
In English the prepositions have to do all the work, without any help from the endings of the words.
But we all have to keep faith.
He had to wash.
If the PM sends the Brexit delay letter, the bloc will have to decide whether to offer an extension.
He has to be defeated, doesn’t he?
I have to go back.
That’s why I have to leave, isn’t it?