16 TENSES

		PAST	PRESENT	FUTURE
simple	+	S + VII	S + (VI + (s/es))	S + shall/will + VI
	−	S + did + not + VI	S + do/does + not + VI	S + shall/will + not + VI
	?	did + S + VI	do/does + S + VI	shall/will + S + VI
continuous	+	S + (were/was) + (VI+ing)	S + (am,are,is) + (VI+ing)	S + shall/will + be + (VI+ing)
	−	S+(were/was)+not+(VI+ing)	S + (am,are,is) + not + (VI+ing)	S + shall/will + not + be + (VI+ing)
	?	(were/was)+S + (VI+ing)	(am,are,is) + S + (VI+ing)	(shall/will) + S + be + (VI+ing)
perfect	+	S + had + VIII	S + (have/has) + VIII	S + (shall/will) + have + VIII
	−	S + had + not + VIII	S + (have/has) + not + VIII	S + (shall/will) + not + have + VIII
	?	had + S + VIII	(have/has) + S + VIII	(shall/will) + S + VIII
perfect continuous	+	S + had + been + (VI+ing)	S + (have/has) + been + (VI+ing)	S+shall/will+have+been+(VI+ing)
	−	S+had+not+been+(VI+ing)	S+(have/has)+not+been+(VI+ing)	S+shall/will+not+have+been+(VI+ing)
	?	had + S + been + (VI+ing)	(have/has) + S + been + (VI+ing)	shall/will+S+have+been+(VI+ing)