To 'see something through' means to finish doing something until completion. When you 'see something through' you continue or persist with something even if it is difficult or unpleasant. To "see somebody through" means to support someone during a difficult time emotionally, physically or by financially providing for them. If you say something will 'see you through' it means that something will provide support or resources enough to support you up to a certain point in time. For example, if you buy a new car, you might say, "That will see me through for the next 5 years."

1. I hate the course I'm doing in college, but I'm determined to see it through to the end so I can get my degree.
2. Keeping a positive mental attitude and speaking to others about what I was going through saw me through that difficult period in my life.

1. Having spent so long working on the project, Alice has every intention of seeing things through before taking her annual leave.
2. I knew that there would be a lot for Jack to have to take in and do during his first week in the job, so I assigned a member of staff to help see him through it.