With the following phrasal verbs, the lexical part of the verb (the part of the phrasal verb that carries the "verb-meaning") cannot be separated from the prepositions (or other parts) that accompany it: "Who will look after my estate when I'm gone?"

Inseparable Phrasal Verbs List

Verb     Meaning     Example

call on     ask to recite in class     The teacher called on students in the back row.
call on (2)     visit     The old minister continued to call on his sick parishioners.
get over     recover from sickness or disappointment     I got over the flu, but I don't know if I'll ever get over my broken heart.
go over     review     The students went over the material before the exam. They should have gone over it twice.
go through     use up; consume     They country went through most of its coal reserves in one year. Did he go through all his money already?
look after     take care of     My mother promised to look after my dog while I was gone.
look into     investigate     The police will look into the possibilities of embezzlement.
run across     find by chance     I ran across my old roommate at the college reunion.
run into     meet     Carlos ran into his English professor in the hallway.
take after     resemble     My second son seems to take after his mother.
wait on     serve     It seemed strange to see my old boss wait on tables.