ただ君をからかっているだけだ。

ordinary; common; usual; free of charge; unaffected; as is; safe; only; merely; just; simply; but; however; nevertheless

you; buddy; pal; monarch; ruler; sovereign; (one's) master

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

only; just; merely; simply; no more than; nothing but; alone; as (e.g. as soon as, as much as); worth

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