Actually, the superlative form of "bonita" wouldn't be "bonitísima", it would merely be "muy bonita". Just like "very beautiful", not "beautifullest"
Answer:
14. <u>tienen ganas</u>
15. <u>tiene</u>
Explanation:
14.
You guys don't <u>have the desire</u> to help because you are tired.
Ustedes no <u>tienen ganas</u> de ayudar porque estan cansados.
15.
You <u>have</u> a very beautiful house.
Usted <u>tiene</u> una casa muy bonita.