โครงสร้าง Tense

Tense		Structure
Present	Simple Tense	S + V1 [ s , es ]
	Continuous Tense	S + is , am , are + V.ing
	Perfect Tense	S + has , have + V3
	Perfect Continuous Tense	S + has , have + been + V.ing
Past	Simple Tense	S + V2
	Continuous Tense	S + was , were + V.ing
	Perfect Tense	S + had + V3
	Perfect Continuous Tense	S + had been + V.ing
Future	Simple Tense	S + will , shall + V1
	Continuous Tense	S + will , shall + be + V.ing
	Perfect Tense	S + will , shall + have + V3
	Perfect Continuous Tense	S + will , shall + have been + V.ing