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I don’t like to be quiet. I didn’t like to be quiet. I am outgoing now. I am quiet now.
used to didn’t used to didn’t use to don’t use to
were not hadn’t haven’t been hadn’t been
i= Im sin ω t i= Im sin（ω t＋90°） i= Im sin（ω t－90°） i= Im sin（ω t＋180°）.
neither；nor either；or so；that not；until
remember return says I didn't
isn't cleaned didn't clean doesn't clean wasn't cleaned
i=Im sin（ω t＋180°） i=Im sin（ω t－180°） i=Im sin（ω t＋90°） i=Im sin（ω t－90°)
Yes, I was No, I wasn’t Yes, I did No, I didn’t
I nodded just now whom I nodded just now I nodded to him just now I nodded to just now
How about you What should I do What’s the matter How are you feeling now
i=Im sin（ω t＋180°） i=Im sin（ω t－180°) i=Im sin（ω t＋90°） i=Im sin（ω t－90°）
didn’t know didn’t recognize didn’t hear don’t know
waited，to waited，until didn't wait，to didn't wait，until
so; that either; or too; to neither; nor
How about you What should I do What's the matter How are you feeling now
hadn’t adapted haven’t adapted don’t adapt didn’t adapt
hadn’t adapted; to haven’t adapted; to don’t adapt; from didn’t adapt; from
didn’t adapt haven’t adapted don’t adapt hadn’t adapted
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