If miriam _______(win) the talent contest, she ______(become) a famous singer. Now she´s a big star. (past model form) please.

Answer 1

The modal verbs in English are as follows, paired as present and preterite forms:

shall and should
will and would
may and might
can and could
mote (Archaic) and must

Answer 2

By the way:
grammar not grammar