Исправь ошибки: steven didnt went to school yesterday february is shortest than january does you need my help usually mr.jackson goes to his office by foot

Didn't go.
is shorter than.
Do you
Mr.Jackson usually goes. В последнем честно не уверен

 Steven didn`t go to school yesterday.
February is shorter than January.
Do you need my help?
Mr. Jackson usually goes to his office by foot.