To indicate a past habit or an action already completedcan be used with or without adverbs of time

To indicate uncompleted action of the past or indicate persistent habits of the past

To indicatea completed action of the past that happened before another event took place

To indicate an action in the past that began before a certain point in the past and continued up untill that time

To express habits or general truhtTo indicate a future event on a designate date as part of a plan or arrangement

To indicate action going on at the time of speaking

To indicate past action which is not defined by a time of ocurrence

To indicate an action which started at some point in the past and may or may not be completed

To indicate an action, condition or cincumstance which has not taken place yet

To indicate what will be going on at some time in the future

To indicate an action that will be complete before another event takes place

To indicate an action that will have happened for some time and will not be completed yet at a certain point in the future