Voy a ir a la casa de mi amigo.
"estudiaría" would be the conditional form of the verb "s/he studies", changing it to "s/he would study"
Sentence #1 has a demonstrative adjective. Sentence #2 has both a demonstrative adjective and a demonstrative pronoun. Sentence #3 uses a regular possessive pronoun. Sentence #4 is the only sentence that uses a present progressive tense.
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The letter 'H' is never pronounced in Spanish. Such examples are "hasta", "horchata", and "humanos". The letter "H" is almost always used exclusively as the first letter in words, but it may be used in the middle of words such as "mucho" or "hechar", where it makes a "ch" sound.
