19
prepositions
× 4 |
4
singular-vs-plural
|
3
articles
|
1
word-meaning
|
12
present-perfect
× 2 |
3
meaning-in-context
× 2 |
2
word-choice
× 2 |
1
conjunctions
|
11
grammaticality
× 2 |
3
phrase-usage
× 2 |
2
semicolons
|
1
conditional-constructions
|
10
past-perfect
× 3 |
3
past-tense
× 2 |
2
questions
|
1
word-order
|
7
vocabulary
× 2 |
3
meaning
× 2 |
2
passive-voice
|
0
infinitives
|
6
word-usage
× 3 |
3
commas
× 2 |
2
pronouns
|
0
idioms
|
5
present-continuous
|
3
difference
× 2 |
2
subjects
|
0
word-request
|
5
verb-forms
|
3
sentence-construction
× 2 |
2
ellipsis
|
0
complements
|
4
punctuation
× 2 |
3
modal-verbs
|
1
grammar
|
0
auxiliary-verbs
|
4
tense
× 2 |
3
definite-article
|
1
progressive-aspect
|
0
prepositional-phrases
|