
动词放句首什么时候要加ing
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作主语的只能是名词、代词、不定式、动名词等。动词不能作主语。但祈使句句首要用动词原形。如:
To clean / Cleaning the house is my job.
Come here!
Be quiet!
To clean / Cleaning the house is my job.
Come here!
Be quiet!
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