Choose the correct preposition after for,up,forward :I was Looking …

The correct preposition to use after "looking" in the context you provided can vary depending on the intended meaning. Here are some common phrases:

1. "I was looking for..." (to search for something)
2. "I was looking up..." (to search for information or to raise one's gaze)
3. "I was looking forward to..." (to anticipate something with pleasure)

Choose the one that fits the context of your sentence.