Grammar forms

New

Present perfect
Past continuous
First and second conditional
Modal verbs
Relative clauses
Adjectives -ed, -ing

What they already know

Present simple & cont
Past simple
Future simple & going to
Comparatives & superlatives
First conditional
Adjectives, adverbs
Linking words (because, but, if)
Relative clauses (a person who, a thing that)
Countable/uncountable (much/many)
Whole bunch of open and closed questions
Prepositions, pronouns, possessives, determiners