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must have left；to take may leave；taking might leave； to take could have left；taking
by; by on ; in on, by with; on
always sometimes often seldom
They take school bus. They take a taxi. Their mother drives for them. Scout troop sends them to school.
riding ride to ride rides
walk take a bus ride a bike take a taxi
good idea ! cool! have a nice trip! take care!
would rather,riding prefer to,ride would rather,ride prefer, riding
could take could have taken must have taken should take
always sometimes often seldom
can’t shouldn’t needn’t mustn’t
don’t have to must can’t ought to
always sometimes often seldom
usually sometimes never seldom
from time to time at times on time at the same time
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