Past perfect
Classified in Electronics
Written at on 
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Present simple- do/does+verb
Present continuous- to be+ ing
Past simple- did+verb(2colum)
Past continuous- was/were +ing
Present perfect simple- has+3clum
Present perfect continuous- has+3+ing
Past perfect simple- had+3colum
Condicionales:
1-present simple(do+verb) + will+verb
2-past simple(2colum) + would+verb
3-past perfect(had+3) + would have + segunda columna
Pasiva:
present- to be + 2 colum (is made of...)
pasado-was/were + 2 colum
Futuro- will be + 2 colum
Indirecto:
Present simple (do/verb)- past simple (2colum)
Present continuous-past continuous
Past sinple- past perfect simple(had+3)
Pps(has+3)- had+3
Must-had to