I have read that book I have been waiting in the queue

for two hours

PRESENT PERFECT SIMPLE PRESENT PERFECT CONTINUOUS

Both tenses are used to express that an action began in the past and it is still going

on, or has some kind of relation to the present time. In many cases, both forms are

correct, but there is often a difference in meaning:

It emphazises the

RESULT of the action

It emphazises the

DURATION or

continuous course of

the action.

*FOR: Desde

hace/Durante

*SINCE: Desde

*ALREADY/YET