The difficulty, besides not catching that 'enseñar' is a regular verb ('e' doesn't change to 'ue'), lies in figuring out which person to use. A conjugated verb has both a tense and a person. The tense, as you already know, is the present.
The person will match the subject.
For instance, in the first sentence 'ella' is the subject. 'She' is a third-person singular form in English and in Spanish. So, the correct verb ending for the third-person singular must be used.
In the sentence "Por las tardes hacemos la tarea juntos," the verb's ending is 'emos'. That means the verb is conjugated in the first-person plural form. That means that the subject is 'nosotros' ('we'), and it carries over into the last sentence. So, the verb 'jugar' needs to be conjugated into the first-person plural form of the present tense ('we play') in the first blank. You don't need to write the subject 'nosotros', because that is conveyed by the verb ending.
The second half of the last sentence has a new subject - él. 'He' is the third-person singular form in both English and Spanish. Therefore, you simply conjugate 'enseñar' using the third-person singular verb ending.
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