その子をからかってはいけない。

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

child; young (animal); young woman; young geisha; offshoot; interest; new shares; player who is not a dealer (in cards, mahjong, etc.); bird egg; -er (often of young women)

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to ridicule; to tease; to mock; to chaff; to razz; to banter with; to make fun of; to poke fun at; to make cracks about

if ... then; when; and; why don't you...?; the more (one does something); because; since