"The woman sees the child."
Translation:Die Frau sieht das Kind.
There is a table for conjugating regular verbs on Basics 1's Tips tab. It can be found to the left of the discussions tab, right below the 4 lessons of Basics 1. (http://duolingo.com/#/skill/de/Basics-1)
Most German verbs are regular and the irregular verbs will need to be memorized. Though most of the irregular verbs do follow a pattern so you do not necessarily have to memorize every single conjugation. (http://german.about.com/library/anfang/blanfang04b.htm)
You can also Google "German conjugation present tense to [verb]" to check the conjugation of a specific verb.
Use "seht" when the subject is second person plural (you guys, you all). Ihr seht.
Use "sieht" when the subject is third person singular (he, she, it). Er/sie/es sieht.