1)一般现在时主要用来表示经常性动作、现在状态、真理和客观事实。常和often, always, every day/morning/weekend, usually, sometimes, seldom, once a week/year等时间状语连用。

　　【例如】

　　My mother works at the same company as my father.The sun rises in the east in the morning and sets in the west in the evening.I like swimming while my husband likes fishing.My mother always has great concern for others.

　　2)在时间或条件状语从句中，一般现在时可以用来表示将来的动作。时间状语从句常由when, whenever, before, after, until, now(that), every/next time, as soon as, the moment/minute等词来引导。

　　【例如】

　　Please be sure to telephone me the next time you come.I will go with you whenever I am free.

　　I will go to visit my supervisor as soon as I arrive in Beijing.If she doesn't tell him the truth now, he'll simply keep on asking her until she____. (CET-4 1998,6)

　　A) does

　　B) has done

　　C) will do

　　D) would do

　　when, whenever, before, after, until, now(that), every/next time, as soon as, the moment/minute等词来引导的时间状语从句，若主句用一般将来时，从句用一般现在时表示将来，故答案为A。

　　条件状语从句常由if, unless, suppose, in case, so long as等词来引导。

　　【例如】

　　We can get there on time if we hurry up.I will not come to the party unless my father agrees.Please take an umbrella with you in case it rains (in case it should rain).