Do you know when that book was
I must buy some milk before mum gets here.
(Don’t put ‘to’ after modal verbs – must, can, should, might etc)
Let me give you some good advice; Never get married!
('advice' is an uncountable noun – 'some advice' / 'a piece of advice')
I can't pass this stupid exam. I don’t have enough vocabulary.
(word order – enough + noun)