次に何を言えばいいかわからない

次: next, second, following, then, stage, order, times, below, below, sequence
に: in, to, on, at, into, upon
何: what, anything, nothing, how many
を: o, the, to, wo
言う: say, tell, speak, mention, express, state, remark
ば: if, by, should, when
いい: good, nice, ok, great, okay, fine
か: or, ka
わかる: i understand, recognize, understood, to understand
ない: no, not, don't, without, missing, absent