![Grammar.com Grammar.com](https://static.stands4.com/app_common/img/top_logo_gra.png)
The Web's Largest Resource for
Grammar & Spelling
A Member Of The STANDS4 Network
![ebook](https://static.stands4.com/app_common/img/grammar/ebook_55_55.png)
Improve your writing now:
Download Grammar eBooks
It’s now more important than ever to develop a powerful writing style. After all, most communication takes place in reports, emails, and instant messages.
- Understanding the Parts of Speech
- Common Grammatical Mistakes
- Developing a Powerful Writing Style
- Rules on Punctuation
- The Top 25 Grammatical Mistakes
- The Awful Like Word
- Build Your Vocabulary
Quiz
Are you a grammar master?
»Identify the sentence with correct use of the past perfect continuous tense:
A
I have played the piano yesterday.
B
We were visiting the museum all day.
C
She had been studying for hours before the exam.
D
He had sings a song for the audience.