Final answer:
Past-tense verbs have been identified and circled in the provided sentences. The suffix -ed and the irregular forms of past verbs, like ate and ran, have been highlighted as indicators of the past tense. The past-tense verbs in the given sentences are lived, attended, did, left, was thinking, and drove.
Step-by-step explanation:
When identifying past-tense verbs in the sentences provided, look for verbs that either end with the suffix -ed or are irregular and do not follow the regular past tense formation. Here are the circled past-tense verbs for each sentence:
- Lived is the past-tense verb in the sentence 'Susan and Alex lived in the city before.'
- In the sentence 'Some students attended the field trip,' attended is the past-tense verb.
- The sentence 'Although Sammy did his homework, he left it at home.' contains two verbs in the past tense: did and left.
- Was in the sentence 'The girl was thinking about her poetry assignment.' is the past-tense helping verb.
- Finally, the verb drove is in the past tense in the sentence 'Mom drove me and her to school.'
The suffix -ed can sometimes be pronounced [d] or [t], as in the case of verbs that end with a t in the past tense, which used to be spelled with -ed. For instance, 'feel' becomes 'felt' and 'bake' becomes 'baked'. Irregular verbs, such as 'eat' which becomes 'ate', do not follow this pattern and must be memorized.