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clean to clean cleaning cleaned
S+V S+V+O S+V+IO+DO S+V+DO+OC
Must; doesn’t have to Do; don’t have to Must; don’t have to Must; mustn’t
from time to time hand in hand one after another step by step
may，mustn't must，must may，may can，needn't
Must; doesn’t have to Do; don’t have to Must; don’t have to Must; mustn’t
throw be thrown be throwing have thrown
careful complete real serious
No, you must Yes, you need N
hand in hand step by step from time to time one after another
hand in hand step by step from time to time one after another
clean; clean cleaning; clean cleaning; cleaning clean; cleaning
from time to time hand in hand step by step one after another
be keep clean be kept clean keep clean kept clean
position situation occasion condition
trying,cleaning try,cleaned t
needn’t; may needn’t; must mustn’t; can mustn’t; may
hand in hand step by step from time to time one after another
cleaning to clean clean cleans
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