Ranked by: number of candidates
1.
Numbers (49033 candidates) 

2.
Preterit (36011 candidates) 
3.
Indirect speech (24055 candidates) 
4.
Conjunctions : bevor, nachdem (11587 candidates) 
5.
Accusative / Dative (9016 candidates) 
6.
Negation (kein, nicht) (6960 candidates) 
7.
Adjectives of nationality (5330 candidates) 
8.
Relative pronouns (4963 candidates) 
9.
Interrogative pronoun : Wo/ wohin (4798 candidates) 
10.
Reciprocal pronouns : sich / einander (3244 candidates) 
11.
Subordinate clauses: dass / ob (2266 candidates) 
12.
Future I (2216 candidates)
13.
Compound words (2031 candidates) 

