帽子をかぶったままで教室にはいるべきではない。

hat; cap

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 put on (one's head); to wear; to have on; to pull over (one's head); to crown (oneself); to be covered with (dust, snow, etc.); to pour (water, etc.) on oneself; to dash on oneself; to ship water; to bear (e.g. someone's debts, faults, etc.); to take (blame); to assume (responsibility); to shoulder (burden); to overlap (e.g. sound or color); to be similar; to be redundant; to be fogged (due to overexposure, etc.); to close; to come to an end; to get a full house; to sell out; to blunder; to bungle; to fail; to be deceived

wet nurse; nursing mother

indicates location of action; at; in; indicates time of action; indicates means of action; cause of effect; by; and then; so; indicates continuing action; indicates certainty, emphasis, etc.

classroom; department; laboratory; single-room school; small school

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to enter; to go into; to break into; to join; to enroll; to contain; to hold; to accommodate; to have (an income of); to get; to receive; to score

shall; should; must

be; is; indicates past or completed action; indicates light imperative

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

not; emphatic suffix