目を閉じてはいけない。

eye; eyeball; eyesight; sight; vision; look; stare; glance; an experience; viewpoint; stitch; texture; weave; ordinal number suffix; somewhat; -ish

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 close (e.g. book, eyes, meeting, etc.); to shut

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