add 要 which means will 我要去学校 means I will go to school

Your question is a bit complex. Technically speaking verbs don't have tenses in Chinese. Generally, we add temoral adverbial or words like 会、将、要 to express a future tense.

Hello! Let me put in this way, there are some expressions about future tense in Chinese, like 要，将，将要,they have the same meaning and fuction with will, be going to, plan to do,etc, but they are used in different occasion. We usually add one of them before the predicate verb and after the subject. Take 要 for example, 我(subject---I)要(will)去(predicate verb---go to)中国(object---China). And about 将：本次会议（The meeting）将（will）在中国（in China）举行(hold)。 BUT we usually use 了 right after the predicate verb or the object or just after the whole sentence, this piont is very different from English!!!!! For example, 我去了中国 （in fact we usually say 我去过中国 in this way）or you can say 我去中国了， but the two kinds of way are different too. Hope that it's usefull for you. -Susan

add 想要/要/将要-----will do 准备 -----prepare to do and also，you can use some time- indicate words like 爱迪生 said

When I want to talk about future events in chinese I just add time words ie: next week下周, next year明年, next time下次, two days from now两天以后.