There are two kinds of phrasal verbs, they are verb + adverb or verb + preposition. It is different from the verbs or the adverbs if they stand alone.
Phrasal Verbs consist of verb + adverb or verb + preposition. The meaning of these combinations is mostly very different from the verb and the adverb or preposition alone. As an example the word “ look “, it will have new meaning if that word is together with adverbs or prepositions.
Examples :
- Look after – Maria usually looks after her niece if she doesn’t have something to do ( look after means taking care of somebody or something )
- Look for – She looks for her purse ( look for means trying to find somebody or something )
- Look down – they look down on me because I come from the village ( look down means thinking somebody or someone is not as good as others)
- Look over – you should look over your lesson before you do the test ( look over means reviewing something )
- Phrasal Verbs ( verbs + adverbs )
Phrasal verbs can stand alone or it can be used gather with object. For example :
- I pick up the phone,
- watch out, the dog will chase you
- Prepositional verbs ( verb + preposition )
For prepositional verbs, the object has to go after the preposition because it can not be separated. For example :
- They often look at this photo ( correct )
- They often look this photo at ( incorrect )
Good Luck 
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