Tell vs. Let someone know vs. Put someone onto

The verbs and expressions mean to give someone facts or information by speaking to them or writing to them.

Tell
- I told him I got a raise yesterday.
- My father told me all the details of my mother's death.
- She didn't tell me where she was going to go.


Let someone know
To tell someone something/some information.

Let some one know something - Let me know your new address.
Let someone know if/whether- Please let me know if/whether you decid to leave.
Let someone know (that)- When he left the country for ever, I let his mother know that he would never come back.
Let someone know where/what/when/why...- Her brother tried to let her know why he changed his mind.Let him know when you buy the cay.

Put someone onto
To introduce a person to something or someone that could bring them an advantage or an useful thing.

- David put me onto a wonderful vegetarian cookery book.
- Can you put me onto (= tell me where to find) a good dentist?
- The elastic is a powerful varity which a friend in the clothing trade put me onto.