Page 428 - Basic Japanese

As shown in the above examples, the use of the perfect

before toki ni is sometimes possible even when the tense of
the whole sentence is future.

Here are some more examples of conditional forms with
the meaning ‘when’:

Eigakan e itte mitara, mō mita koto no aru eiga deshita.

When I went to the theater and looked, it was a
film I had already seen.

Ni-jikan benkyō shitara, shokuji o shimashō.
When we’ve studied for two hours, let’s eat.

8.12. Asking for advice

To ask for advice, use an expression like one of the

following:

Nani o shitara ii deshō ka.
What should I do? (lit., If I were to do what,
would it be good?)

Nani o sureba ii deshō ka.
What should I do? (lit., If I do what, will it be

good?)

Dō shitara ii deshō ka.