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The play may begin at any moment,'I said.'It may have begun already,'Susan answered.I hurried to the ticket office.'May I have two tickets please?'I asked.'I'm sorry,we've sold out,'the girl said.'What a pity!'Susan exclaimed.Just then,a man hurried to the ticket office.'Can I return these two tickets?'he asked.'Certainly,'the girl said.I went back to the ticket office at once.'Could I have those two tickets please?'I asked.'Certainly,'the girl said,'but they're for next Wednesday's performance.Do you still want them?''I might as well have them.'I said sadly.
☆at any moment:在任何时候，随时
at the moment=now
at that moment=just then:就在那时
☆have是最活跃的词，可以指任何的意思
have coffee:喝咖啡
have a ticket:买票（习惯用法）
I'll have/taken sth.我买……
must，can't，may+动词原形, 表示对现在、未来的推测
She must be a model. （must 一定, 很可能）
She may be a model. （may 有可能）
She can't be a model. （can't 不可能）
may，must，can't + have done，表示对过去的推测
She must/may/can't have been a model.
I must/may/can’t have watched TV
