was+动词ing:

是三单用的[过去进行时],表达一个动作在过去进行了一段时间.如:

He

was

playing

footing

for

two

hours

last

night.She

was

singing

a

song

when

I

called

her.The

dog

was

barking

loudly

this

morning.was+动词

ed

:

是三单用的过去时态的[被动语态].如:

He

was

given

two

hours

to

play

football

last

night.A

song

was

sung

by

her

last

night.A

stranger

was

barked

by

the

dog

this

morning.