Note: do not use "to" after "should" or "must" Otherwise, these four expressions are similar, but with slight differences. 1) "have to" = expresses general obligation; can be used in past, present, and future tenses (had to, have to, will have to); more common than "must" in casual American English 2) "must" = expresses general obligation; can only use in present or near future; a bit more formal; often used in official documents; less common in casual American English 3) "need to" = expresses that something is important and/or required for a specific reason; can be used in past, present, future tenses (needed to, need to, will need to) 4) "should" = less binding, more of a strong recommendation rather than an obligation; for past tense used more as in negative form as a regret (i.e. should have done this, but did not); otherwise used in present or near future Hope this helps :)

The second one is correct. The first one is not. It should be "This is what I got out of it." It's a more casual expression. (I speak American English from the eastern coast. It could be different in other places.)

In the USA, a full-time college student is usually defined as someone taking at least 12 credits per semester. A semester is about 4 months long, either from August/September to December, or from January to April/May. Each college class is assigned a number of credits. For example, an "easier" class may be 1 or 2 credits. A harder class may be 3 or 4 credits. By this definition, a part-time college student in the US is someone who takes 11 credits or less per semester. There are probably different systems in different countries. Also, I'm not sure if you are referring to college students or grade school students. This is just how full-time and part-time are defined at a typical 4-year university in the USA.

Both sentences are correct :)