私は娘をどう扱ったらよいのか全然わからない。

I; me; private affairs; personal matter; secrecy; selfishness

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

(my) daughter; girl (i.e. a young, unmarried woman)

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.

how; in what way; how about

to deal with (a person); to treat; to handle; to take care of; to entertain; to deal with (a problem); to handle; to manage; to operate (e.g. a machine); to handle; to work; to deal in; to sell; to cover (a topic); to treat; to discuss; to take up; to treat A as B; to mediate (an argument); to be too much for one; to find unmanageable; to gossip

good; excellent; fine; nice; pleasant; agreeable; sufficient (can be used to turn down an offer); ready; prepared; profitable (e.g. deal, business offer, etc.); beneficial; OK

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

indicates a question (sometimes rhetorical); or; whether or not; some- (e.g. something, someone); indicates doubt, uncertainty, etc.; emphatic prefix; suffix forming adjectives or adverbs; in that way

not at all (with neg. verb); wholly; entirely; completely

to understand; to comprehend; to grasp; to see; to get; to follow; to become clear; to be known; to be discovered; to be realized; to be realised; to be found out