Study the topic Tenses thoroughly before going through it. This topic is intended only to a quick revision.
SIMPLE ( PRESENT / PAST / FUTURE ) TENSE
S + ( do/does+ V ) ( did + V ) ( will/ shall + V) + O.
( PRESENT / PAST / FUTURE ) CONTINUOUS TENSE
S + ( is/ am/are + v+ing ) ( was/were + V+ing ) ( will/shall + be + V+ing) + O
( PRESENT/ PAST / FUTURE ) PERFECT TENSE
S + ( has/have + V3 ) ( had + V3 ) ( will/shall + have + V3) + O
( PRESENT / PAST / FUTURE ) PERFECT CONTINUOUS TENSE.
S + ( has/have + been + V+Ing ) ( had + been + V +ing ) ( will/shall + have + been + V+ing ) + O
