every day an old man can be seen ----(clean)the street in the morning

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every day an old man can be seen ----(clean)the street in the morning
every day an old man can be seen ----(clean)the street in the morning

every day an old man can be seen ----(clean)the street in the morning
to clean
要领有二:
第一知道是被动,be seen
第二:
在主动的时候,感官动词,和使役动词,make,let ,have ,省略to 的时候,被动要把to 加上

cleaning



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