—I felt it very difficult to carry on the work all by myself. —I could have helped you, but you _____me to.
Tom gave Helen an apple in exchange for a piece of cake.
He sat down at his desk to figure out the exact figures.
He's devoted his whole life to the protection of the rare animals.
It struck me that we ought to make a new plan.
The moment I saw him, he began to complain about the bad weather he had while traveling here.