In the past continuous tense, what form of the main ...

★ Past Simple and Past Continuous Tenses

In the past continuous tense, what form of the main verb is used?

A. Base form

B. Past participle

C. Future participle

D. Present participle (-ing form)

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How are regular verbs formed in the past simple tense?

A. By adding -s to the base form

B. By adding -ed to the base form

C. By adding -en to the base form

D. By adding -ing to the base form