to do something unsuspectingly

to do something perfectly innocently

Something must be done

something has been omitted

to do something in a rush

Something has gone wrong with me.

or something

[something repeated unnecessarily]

or something like that

to do something about something

something of the kind

something is a burning issue to someone

to be up on something

to do something deliberately

to do something on purpose

to do something intentionally

to do something with intent

to be up to something

to do something with good intentions

to do something with evil intentions

to do something with malicious intent

Is something wrong?

something has to give

Something is rotten in the state of Denmark.

something is in the wind