here is a grammar guide to help students use the  present perfect continuous with lots of examples . it has been raining ,or  how long have you been  working?...;

present-perfect-continuous-grammar-guide-grammar-guides_80064.doc

Present perfect continuous (progressive) tense

Present perfect continuous grammar guide

present-perfect-continuous-grammar-guide

Let's do English ESL grammar guide. here is a grammar guide to help students use the  present perfect continuous with lots of examples . it has been raining ,or…