At the B2 level (according to the European scale) the student should be confident with the following grammar:<p>

Countable and uncountable nouns.<br>
See this exercise: <a href="http://englishbanana.com/big-resource-folder/1-Elementary/Vocabulary/Quantities/shopping-list-mixed-up-quantities.pdf">Mixed Up Shopping List</a>.<p>

Modals of deduction and speculation.<p>

Gradable and non-gradable adjectives.<p>