Cách làm cho bạn:
1. am preparing
2. does; is working
EX 4. Complete the sentences from the conversation with the correct forms of the verbs in brackets.
1. I'd love to, but I'm afraid I can't. I (prepare) __________ dinner.
2. My mum usually (do) __________ the cooking but she (work) __________ late today.
1. am preparing
2. does; is working
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