1. Make up 3 sentences using at least three of the following words:

experiment, to contribute, to compare, conclusion, to estimate, to analyze, internal, to interact, to observe, to invent, to combine

All three sentences must be in different tenses.

2. Make up three sentences with any of the following phrasal verbs:

take off, take after, look after, look forward, get along, get away with, give in, give away.