xtao general rules regarding this kind of combination "(verb+ing + noun)" ? Unfortunately, this is a matter of usage rather than grammar. Both forms are often possible, and it's a matter of what people choose most often.
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xtaogeneral rules regarding this kind of combination "(verb+ing + noun)" ?Unfortunately, this is a matter of usage rather than grammar. Both forms are often possible, and it's a matter of what people choose most often. In your specific example, most recently I have heard "wait time" more often than "waiting time", but I have heard both.