Arabic is no doubt a very vast laguage. In other languages when we talk to each other we can easily get that in which tense we are talking about. But in Arabic there are only two forms for tenses i.e. 1) Past 2) Present and Future(مضارع). The only form used for the both teses Present and Future is same.
The question is this that how by the law and rule of Arabic grammer, we can identify or bifurcate the form/word used for the both Present and Future tense as only as Present or Future in a particular situation or in sentense.