I (look for) my key.

I look for my key.

I looked for my key.

I shall look for my key.

I should look for my key.

I am looking for my key.

I was looking for my key.

I have looked for my key.

I had looked for my key.

I can look for my key.

I may look for my key.

I must look for my key.

I have to look for my key.

I could look for my key.

I might look for my key.

I am able to look for my key.

I had to look for my key.