學校要改timetable~55min一堂,我覺得唔錯。

Ask after sb : 探問, 問下sb最近點~

e.g. Tom rang just now and ask after you, so I told him you were fine.

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Ask around : 問人for information or help | 邀請某人

e.g.1 I have no idea, but I'll ask around at work and see if anyone can help.

e.g2 I asked them around for party.