The modal particle '了' at the end of a sentence indicates a change in state or the emergence of a new situation ('has become...', 'it is now...').
Indicates that an event or change is about to happen in the very near future ('about to / going to...'). Note: specific time nouns can precede '就要……了', but NOT '快要……了'.
Both express capability or possibility. '可以' and '能' also express permission depending on circumstances. In the negative: '不能' means unable or not permitted; '不可以' expresses strict prohibition.
Used to express an impression based on visual observation ('it looks like...', 'appears to be...').
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