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2. Perhaps he will call you soon. He _________ you soon. they are playing on the playground.They __________ on the playground. may be may call may be playing1. I’m sure you are very tired. You _________ very tired. 2. I’m sure dad is repairing the car now. Dad ___________ the car now. 3. I’m sure he isn’t a doctor. He _________ a doctor. 4. I’m sure he isn’t working. He is sleeping. He _________ working. He _______ sleeping. must be must be can’t be can’t be must be repairingGrammar Bverbs+ toinfinitives(不定式 ) four months old, she started to go outside for the first time. she was six months old, she began to eat bamboo. she was 20 months old, she learnt to look after herself. Other words +to do? 不定式作 賓語? agree to do? fet to do? remember to do? prepare to do? begin to do? hope to do? decide to do? learn to do? try to do study? act? hunting? protection? painting? sadness? kindness