Wait until I return.

Warn of = সর্তক করা = They warned him of the dangers of sailing alone.

Was I seen by you before?

Was Jim ever late?

Was that the reason for his removal?

We built national memorial for paying homage to the martyrs who died in the Liberation War of 1971.

We expect we shall be at Rajshahi next week.

We must guard against our mistakes.

We must help him. (Negative) = We can not but help him.

We not only gave him food but also shelter.

We reached the station after the train had come.

We refused his invitation.

We shall discuss about the matter. = We shall discuss the matter.

We should abide by the rules.

We should abide by the law.