Rewrite the following sentences without changing their original meaning. Begin with the words or phrases given

Rewrite the following sentences without changing their original meaning. Begin with the worlds or phrases given:
1. Scientists have invented new devices to help people live a longer life.
-> New devices.............
2. I can't tell you because I don't know the answer.
-> If...................
3. "My mother will celebrate her birthday next weekend."Patricia said.
-> Patricia said..............
4. They provided food then cleared up the debris.
-> After they had............