"something 不上" means?
e.g. 跟不上 - can't keep up
赶不上 - can't catch up
Does "不上" in the pattern "(verb)不上" simply mean "unable to (verb)"?
If so, can "不上" be used with any verb?
e.g. Wor chang bu shang zhe shou ge (I can't sing this song)
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