Write PS (Present Simple), SP (Simple Past) or PC (Present Continuous) next to each sentence. Colour the time expressions you identify on them.

its hard for me to see which word is supposed to be in bold. if i knew then i would be able to better.

yes you could be a life guard if that the question.

in my opinion, ap calculus was the most difficult. i often struggled with it a lot. however, i have gotten a lot better.