この網は蚊を寄せ付けないためのものだ。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

net; netting; web

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

mosquito

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 let (someone) come near; to let (someone) get close

good; advantage; benefit; welfare; sake; purpose; objective; aim; consequence; result; effect; affecting; regarding; concerning

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

thing; object; article; stuff; substance; one's things; possessions; property; belongings; things; something; anything; everything; nothing; quality; reason; the way of things; used to emphasize emotion, judgment, etc.; used to indicate a common occurrence in the past (after a verb in past tense); used to indicate a general tendency; used to indicate something that should happen; item classified as ...; item related to ...; work of ...; cause of ...; cause for ...; somehow; somewhat; for some reason; really; truly

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