1- Use and omission of definite article.
2- Compound nouns and adjectives.
3- Possessive pronouns and object pronouns.
4- Saxon genitive: special cases.
5- Position of prepositions.
6- Prepositional  phrases: owing to, due to, except for, by means of, because of, 
     by way of, on account of,  on behalf of, on top of, etc.
7- Word formation.
8- Like / As
9- Comparison: the...the....
10- Not only +inversion. Not only .....but also.....;  as well as...+ -ing.
11- Quite / rather
12- Order of adjectives.
13- Verbal tenses: present simple / present continuous,  future perfect / future 
     continuous. Active and passive form.
14- -ing after certain prepositions (for, by, like...) Look forward to + ...ing. Be 
     used to +...ing.
15- Gerund or infinitive after certain verbs.
16- Modals: used to / would. Needn't followed by past infinitive / didn't have to.
17- Be allowed to / be supposed to ,  be (un)likely to , be bound to, be certain to.
18- Phrasal verbs.
19- Get followed by past participle, followed by comparative forms: get going, get
     (sth) done; get bigger (and bigger)
20- Wish, If only followed by past simple, past perfect or would. (Subjunctive 
     use)
21- It's time + past simple  (Subjunctive use) 
22- Was / were : alternation (subjunctive use: if he were / was) there is / there 
     are, there's a lot of  + plural noun (there's a lot of people)
23- Shall / will.
24- Tag questions . Reply questions.
25- Conditional clauses with if, unless, in case, provided that, as long as, whether,
     if ever.
26- Subordinate clauses with  whenever, whatever. wherever , no matter how.
27- Clauses of purpose: so as to.
28- Clauses of reason or  cause: as, since.
29- Clauses of manner: as, as if, as though.
30- Clauses of contrast: whereas, while.
31- Clauses of concession: even if, even though, in spite of , despite.
32- Clauses of time: by the time, once.