I'm about to go shopping.
Something came up, so I'm not able to make it.
I wouldn’t want to go to Mars because they don’t have Taco Bell there.
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 go so the verb form of this is to go.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You have to remember the い portion. To remember い we use the word "eagle."
You want to go somewhere (anywhere!) but you can't. An eagle (い) blocks your path. You try to go forward and it opens its wings and bites at you. You try to go back and it jumps at you. There's nowhere for you to go with this eagle standing there.