Si conoces lo que son las 'If Sentences' seguramente te habrás dado cuenta que son utilizadas muy a menudo. Si no sabes qué son las 'If Sentences' lee a continuación...
Las 'If Sentences' u 'oraciones condicionales' son oraciones que indican que si sucede x condición, seguramente (o probablemente) sucederá x consecuencia. Dependiendo de la seguridad con la que la consecuencia suceda es el tipo de oración que usaremos.
Hoy veremos las If Sentences del tipo II.
'If I won the lottery I would buy a new house'
'Si ganara la lotería, compraría una nueva casa'

Usamos el pasado simple para hablar de la condición 'If I won the lottery' y usamos would + verbo infinitivo para hablar de la consecuencia 'I would buy a new house'.
Al utilizar el condicional del tipo II damos la idea de algo que es poco probable que suceda en el futuro o puede ser que nos estemos refiriendo a una idea hipotética.
'If I were you, I would go on a diet'

Nota: Fíjate que en este tipo de oración condicional es común usar 'were' en lugar de 'was' con las personas I, he, she, it.
Luego de ver como son estas oraciones, puedes ahora escuchar esta canción de Beyonce, en donde encontrarás muchas oraciones condicionales del tipo II
Atención: donde veas: I'd es la forma abreviada de 'I would'
If I were a boy
Even just for a day
I’d roll out of bed in the morning
And throw on what I wanted and go
Drink beer with the guys
And chase after girls
I’d kick it with who I wanted
And I’d never get confronted for it
Because they’d stick up for me
If I were a boy
I think that I’d understand
how it feels to love a girl
I swear I’d be a better man
I’d listen to her
cause I know how it hurts
when you loose the one you wanted
cause he’s taken you for granted
and everything you had got destroyed!
If I were a boy
I would turn off my phone
Tell everyone that its broken
so they think
that I was sleeping alone
I’d put myself first
and make the rules as I go
cause I know that she’ll be faithful
waiting for me to come home (to come home)
If I were a boy
I think that I could understand
how it feels to love a girl
I swear I’d be a better man
I’d listen to her
Cause I know how it hurts
when you loose the one you wanted
cause he’s taken you for granted
and everything you had got destroyed!
It’s a little too late for you to come back
Say its just a mistake
Think I forgive you like that
If you thought I would wait for you
You thought wrong
But you're just a boy
You don’t understand (and you don’t understand)
How it feels to love a girl
Someday you’ll wish you were a better man
You don’t listen to her
You don’t care how it hurts
Until you lose the one you wanted
Cause you've taken her for granted
And everything that you had got destroyed
But you're just a boy...