English tenses mathematically

 English Tens in my opinion

Indication= "S" for subject,  "V" for verb,     "O" for object,      "HP" for Helping verb, 

                      "V1,V2,V3" for  verb {first form,2nd form, 3rd form}

Tens	simple	continuous	perfect	P-continuous
Present	S+V.1+O	S+HP+V+Ing+O	S+have-been+V3+O	S+have-  been+V+ing+O
Past	S+V.2+O	S+had+V+Ing+O	S+had-been+V3+O	S+had-been+V+ing+O
Future	S+will or shall.V1+O	S+will or shall+be+V+Ing+O	S+will or shall+have+V3+O	S+will or shall-have-been+V+ing+O