a) Los conectores que vamos a ver ahora tienen el mismo significado y van seguidos de oracion( sujeto + verbo):

Indican la razon o la causa de algo. Cuando estos conectores empiezan una oracion, la principal y la subordinada van separadas por comas:

Because/As/Since/Seeing that she was busy, I typed all the letters.
I typed all the letters because /as /since seeing that she was busy.

b) Estos conectores indican porque ( razón por la que). Van seguidos de expresion sustantiva. Si comienzan la oracion, ambas oraciones van separadas por comas.

Because of/ On account of/ Owing to the low ticket sales, the concert was cancelled.
The concert was cancelled because of / on account of / owing to the low ticket sales.

c) Los conectores siguientes expresan proposito. In order to, so as to, y to, vas seguidos de la raiz del verbo. In order that, so that van seguidos de una oracion con verbo modal.

He bought a computer in order to / so as to / to work more quickly. **
He bought a computer in order that / so that he could work more quickly.

d) En el ingles ORAL ( IMPORTANTE PARTE CONVERSACION) se suele omitir that cuando se usa so that.

I turned on the light so I could see more easily.

** ” In order to” y “so as to ” , son mas formales que “to” . ” In order to” y “so as to ” tambien tienen forma negativa, la cual es in order not to y so as not to.

So as not to wake my parents, Juliet took her shoes off when she went upstairs. ( Para no despertar a sus padres, Juliet se quito los zapatos cuando subio las escaleras).

( Modificado en 22 de julio )