sb look for sth.一句中"for"是介词还是仅仅起构成动词短语的作用.

sb look for sth.一句中"for"是介词还是仅仅起构成动词短语的作用. leave for 到底是动词短语还是介词短语? hand 做动词是hand sth to sb还是hand sth for sb? 是send sth to sb 还是send sth for sb 是offer sth. for sb.? 还是 offer sth. to sb.? 是arrange sb for sth还是arrange sb with sth 是leave sth.to sb.还是leave sth.for sb. 是feed sth to sb还是feed sth for sb? 是offer sth.for sb.还是 offer sth.to sb. 是provide sb.for sth还是provide sb with sth? 是offer sth.for sb.还是 offer sth.to sb 是prepare sb with sth还是prepare sb for sth