00:00present simple i study every day present continuous i am studying now present perfect
00:11i have studied this lesson present perfect continuous i have been studying for two hours
00:22past simple i studied yesterday past continuous i was studying when he called
00:33past perfect i had studied before the exam
00:39past perfect continuous i had been studying for hours before the exam
00:47future simple i will study tomorrow future continuous i will be studying at 8 pm
01:00future perfect i will have studied by tomorrow
01:06future perfect continuous i will have been studying for three hours by 9 pm
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