Irregular Verb List

Exercise 3: 

1. I'm sure we ______________ the parcel last Friday.

 send  sent

2. How did you ______________ him to be a polite child?

 teach  taught

3. They couldn't ______________ what he was saying.

 understand  understood

4. I've always ______________ doplhins are smarter than whales.

 think  thought

5. You haven't ______________ all that money already, have you?

 spend  spent