A phrasal verb combines a base verb with a preposition or adverb (or both) to create a brand new meaning that often cannot be guessed from individual words alone.

Must-Know Phrasal Verbs with "LOOK"

• Look into: Investigate. (The police are looking into the robbery.)
• Look after: Take care of. (She looks after her elderly parents.)
• Look down on: Consider someone inferior. (Never look down on honest work.)
• Look forward to: Await with excitement (Takes gerund: looking forward to meeting you).

Must-Know Phrasal Verbs with "PUT"

• Put off: Postpone. (The meeting was put off until Monday.)
• Put out: Extinguish a fire. (Firefighters quickly put out the flames.)
• Put up with: Tolerate. (I cannot put up with this constant noise.)