i'm not sure what to expect because i 've never seen an indi

i'm not sure what to expect because i 've never seen an indian film before.
be (not) sure to do sth 词组.因为do和cxpect是及物动词,他们需要有宾语,因为这个用作宾语的sth成了what(不知道的东西),而what疑问词只能放在不定式符号to的前面.