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When I upgraded to Win10, I found a terrible change:
Microsoft had disabled the composite key 「ctrl+space」 to switch language between Chinese and English, which drove me crazy because I used this composite key every day.
So I decided to find the alternatives, and luckily, I have found the best solution, which is 「SendKeyForIME」.
This tool had no GUI, you can open it, and it would stay in the background.
With this app was opened, when you clicked the composite key 「ctrl+space」, it would automatically catch this signal a send another composite key 「Ctrl+Shift」 to the system.
As long as making this app run on the system startup, you can find back your familiar habit:)