The verb tell is usually followed by an object, that is, we usually say who is told.
- "Put the money in the slot", he said.
- "Put the money in the slot", he told me.
- We said, "Happy birthday!" (NOT We told him, "Happy birthday").
- "Where do you live?" he said. (NOT "Where do you live?" he told me).
Say is more commonly used without an object, but when it does have one, we use the word "to".
- I told her that she was wrong.
- They told us that we could keep the objects.
When tell has the meaning of "instruct", it can be followed by an object and an infinitive.
- I said that she was wrong. (NOT I said her that …).
- I said to her that she was wrong.
We cannot use say in this way.
- She told me to leave.
- They told us to keep the objects.
Tell is used (with or without a personal object) in some common expressions:
- Tell a story (He told (us) a frightening story).
- Tell a joke (I'll tell (you) a joke I heard today).
- Tell a lie (She told (me) a lie).
- Tell the truth (Next time, she will tell (me) the truth).
- Tell the difference (Can you tell (me) the difference between a frog and a toad?).
- Tell the time (I can't tell (you) the time because it's too dark). "
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