[ Punctuation ]
Choose the correct sentence that uses a comma with a non-defining relative clause.
A. My grandfather, a professor, has written a book.
B. My grandfather a professor has written a book.
C. My grandfather has written a book, a professor.

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Gerund vs InfinitiveConditionals / Unreal PastComparison of Adjectives and AdverbsPresent TensesGrammar - Countable/ UncountableWish clauseWas and WereWould/would like - affirmative/negativeNo Excuse Words / Conjunction SOModals of AdvisabilityOther quiz:
Modal Verbs › ViewAll paragraphs in a for-and-against essay must be the same length
A. TRUE
B. FALSE
Idioms › View
After staying awake late at night studying, I felt tired the next day.
a. an angel
b. an all-nighter
c. an atmosphere
My cat … little and cute.
A. am
B. is
C. are
Grammar › View
___ is very good for your health.
A. Swimming
B. Swim
C. Swims
D. Swam
