HSK 5 grammar · pattern
怎么都/也+不/没
怎么都/也+不/没 — no matter what, just won't
Pattern
+ + +
( ) can be left out · other words may come before, between and after
How it works
怎么…都/也 followed by a negative stresses that no method works: "no matter what/how, just … not." It says every attempt fails, emphasizing total impossibility.
Examples
这个字我怎么也想不起来了。
Zhège zì wǒ zěnme yě xiǎng bu qǐlái le.
No matter how I try, I just can't recall this character.
门锁住了,我怎么都打不开。
Mén suǒzhù le, wǒ zěnme dōu dǎ bu kāi.
The door is locked; I can't get it open no matter what.
Related

See it in a story
In the app, 怎么都/也+不/没 is underlined wherever it appears in the stories you read, and practised with sentences from them. Free.