彼は恐らく僕らに悪ふざけをしていたわけではあるまい。

he; him; his; boyfriend

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

perhaps; likely; probably; I dare say

we

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

prank; practical joke; horseplay; mischievous trick

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 do; to cause to become; to make (into); to turn (into); to serve as; to act as; to work as; to wear (clothes, a facial expression, etc.); to judge as being; to view as being; to think of as; to treat as; to use as; to decide on; to choose; to be sensed (of a smell, noise, etc.); to be (in a state, condition, etc.); to be worth; to cost; to pass (of time); to elapse; verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs"); creates a humble verb (after a noun prefixed with "o" or "go"); to be just about to; to be just starting to; to try to; to attempt to

conclusion from reasoning, judgement or calculation based on something read or heard; reason; cause; meaning; circumstances; situation

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

a certain ...; some ...

probably isn't (doesn't, won't, etc.); don't (doesn't) intend to; intend not to; must not; (when used in an imperative sentence) don't