The key answer of exercise Grammar 1
The key to exercise solutions in chapter 02 - Grammar focus 1 for the textbook Cutting Edge Pre-Intermediate - Student's Book with authors Sarah Cunningham, Peter Moor and Araminta Crace from Pearson Education
Question
Write down the infinitive forms of the regular verbs you underlined. How do we form the Past simple of regular verbs?
Answer
- invent
- transmit
- last
- start
- watch
We form the Past simple of a regular verb by adding -ed to the end of the infinitive. If the infinitive ends with a consonant-vowel-consonant, and the last syllable is stressed, then we double the final consonant, e.g. transmit-transmitted.