"you will have to work tomorrow" the teacher said to us

"You will have to work tomorrow" the teacher said to us. The teacher said do us that we would have to work the next day.

The teacher told us we would have to work the next day.

There are two ways of expressing the speakers speech. They are direct speech and indirect speech. When we change direct speech into indirect we make some changes. We change pronouns, tenses of verbs. In these sentences we change you into we. Future (will) is changed into conditional (would). And we change tomorrow into the next day. We can also change say to into tell.