1.My parents(to buy) a new microwave a week ago.
2.Dan (not to thank ) me for my help.
3.Martha (to know) his address.
4.He (to teach) me to swim last summer.
5.My sister(not to help) me to tidy our room last Saturday.
6.She (to make) you some sandwiches and a cup of tea for breakfast.
1. bought
2. not to thanked
3. knew
4. taught
5. not to helped
6. made