its asking you to put in the accent marks on the words. For example lapiz should be lápiz.
If we are talking about just plain old present tense, then it is -an.
Example: hablar
ustedes hablan
Marta recibe un e- mail de su mejor amigo( a)
<em>Costar- </em><em>the meaning is cost or like how much some one charges you for something.</em>
<em>Estar- </em><em>is "be" like for example when you say I'm going to "be" at my friends house then "be" would be estar</em>
<em>Ir- </em><em>means "go", I'm going to go to the beach.</em>
<em>Dar- </em><em>is "give", I want to "give" this to you.</em>
<em>Recibir- </em><em>means "receive", Did you "receive" my text?</em>
<em> </em><em>Sentences:</em>
<em>1. Cuanto </em><u><em>cuesta </em></u><em>eso?</em>
<em>2. Yo voy a </em><u><em>estar</em></u><em> en casa de mis amigos.</em>
<em>3. Yo voy a </em><u><em>ir </em></u><em>a la playa.</em>
<em>4. Te quiero </em><u><em>dar </em></u><em>este collar.</em>
<em>5. </em><u><em>Recibistes </em></u><em>mi texto?</em>
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<em>Hope it helps, :)</em>