Of course , chinese has grammer , and tence , btw, we have plural too.
Gees Jeff you surprised a lot , that you tried to tell the kids chinese has no tense .
主谓宾， 定状补。 that is the most important part of chinese grammar to me , we have verb, noun, adj, adv, we have everything .
About tence , somehow you could say that is more simple than english, but we still have that , okay , i did , 了， i have done, 我已经。 I will， 我要， 我将要. i am going to , 我准备， 我计划。
Basically， all the tence in English and in German, could be translated accuratly into chinese .
Schocked me a lot by seeing some chinese said no grammar about chinese , are you speaking broken chinese all the time?