[ Mixed Present Tenses ]
You really must be tired! You ……………………………….( work) on your book all day long.
A. have worked
B. are working
C. work
D. have been working

Random Topics:
Grammar, adverbs of frequency placementMain Idea and Sentence StructureModal Verb, Passive VoiceSo Such Enough TooFirst ConditionalSimple Present & Present ProgressivePast Tense (Regular and Irregular)Sentences vs Run-OnsPresent Progressive TenseSubordinating ConjunctionsOther quiz:
Grammar › ViewBe careful, don’t hurt __________________.
A. You
B. Youself
C. Yourselfs
D. Yourself
Tenses › View
I ____ (never eat) breakfast before my morning classes, but maybe I should start!
A. never eat
B. am never eating
C. have never eaten
Grammar › ViewI have to look for another source for my research, _______ the ones I found are not reliable.
A. For
B. Yet
C. And
D. So
Grammar › View
Choose the correct sentence(s):
A. We didnt want to take the test, because we didnt understand the content.
B. We didn’t want to take the test we didn’t understand the content.
C. We didn’t want to take the test. We didn’t understand the content.