-Why couldn’t you get home that day? -Because______12:00 all the buses had left.

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must be playing could be playing must have played must have been playing

of at by until

get on get down get through get to

could be playing must be playing must have been playing should have played

must be playing could be playing must have played must have been playing

didn’t; must have been playing didn’t; must be playing couldn’t; must have played couldn’t; must be playing

responsible beneficial punctual regular

did; get over do; get it didn’t; get together did; get through

I don’t want to outstay my welcome I guess I can get away with that I’d better make myself at home one man’s meat is another man’s poison

why the reason because for

mustn't shouldn't needn't couldn't

must be playing could be playing must have played must have been playing

don’t you wasn’t it do you hadn’t it

started; filling to run; filling going; fill starting; filling

didn't; must be playing couldn't; must be playing couldn't; must have played didn't; must have been playing

determining determined determine being determined

which where in which in tha

Once in a while After all On the other hand For example

shouldn't have been mustn't have been couldn't have been couldn't be