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Classified in English
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tiempos verbales.
-P.Simple (usually, every day, always)
s+vb's
s+tobe
*is built*
-P.Continuo (now, at the moment)
s+tobe+vb+ing
*are being built*
-P.Perfecto (for/since) (already, while, this month, today,
ever, never, this week)
s+have+3
*has been built*
-Goingto (next week, tomorrow, next month)
s+tobe+goingto+vb
-Will (the next year, meteorology, in the future)
s+will+vb
*will be built*
-Pasado.Simple (yesterday, the last..., when, ago)
s+vb+2
*was built*
-Pasado. Continuo
were building
*were being built*
-Pasado perfecto
has cleaned
*has been 3*
-Futuro perfecto
will have signed
*will have been 3*