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can’t needn’t mustn’t don’t
Don’t get on, until Get on , until Don’t get on, before Get on, before
stop stops stopped will stop
Not until，had left Not until，has forgotten It was not until，had left It was until，has forgotten
wait until the bus or tram has left before you cross. always make sure you are behind the bus or tram. never cross in front the bus or tram. always cross in front the bus or tram.
cross to the opposite side of the road before signaling the bus or tram to stop step into the road in good time before the bus or tram arrives. not leave the pavement until the bus or tram has stopped. only leave the pavement to signal the bus or tram to stop.
There being no bus; before We couldn’t find a bus; until There was no bus; when There no bus; since
wait until the bus or tram has left before you cross. always make sure you are behind the bus or tram. never cross in front the bus or tram. always cross in front the bus or tram.
cross to the opposite side of the road before signaling the bus or tram to stop step into the road in good time before the bus or tram arrives. not leave the pavement until the bus or tram has stopped. only leave the pavement to signal the bus or tram to stop.
waiting to wait wait to be waiting
stop stops stopped will stop
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