I came from America.
She will come. I'm sure she will come.
Never come back!
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means come so you know this word means to come.
The reading for this word is pretty strange. It changes depending on the type of verb form you use (it's a pesky exception verb). To remember the reading of this word, here's a mnemonic:
"I want you to come to the cool (く) side, Luke," says Darth Vader.
"What?" replies Luke.
Just replace this line into the famous line from Star Wars. Say it out loud. Do the Vader voice. It'll help you to remember.