Sara usually (put) on black shoes but now she (wear) white

Sara usually puts on black shoes but now she is wearing white trainers.

There are two keywords in this sentence. These keywords are usually and now. Usually is the keyword of Present Indefinite. Now is the keyword of Present Continuous. So, the first part of the sentence is in Present Indefinite and the second part is in Present Continuous.

Present Indefinite is used for a common action. Present Continuous is used for an action at the moment of speech. Present Indefinite is formed with the help of the suffix s or es. We add this suffix in the third person singular (he, she, it). Present Continuous is formed with the help of the auxiliary verb to be (am, is are) and with the help of the suffix ing.