Constractive Conjunction and Modal Perfect

Contrastive conjunctions
Contrastive conjunctions are used to link two different ideas or statement that has contrast meaning.

·         But	·         Tetapi
·         Still	·         Masih
·         Although	·         Walaupun
·         Though	·         Meskipun
·         Whereas	·         Sedangkan
·         While	·         Sementara
·         Yet	·         Namun

Examples are:
► It is a small but practical kitchen.
► Despite lower carbon dioxide emissions, diesel cars may promote more global warming than gasoline

      cars.
► In spite of the cooling tend that has been observed for Antarctica as a whole, one region of the continent

     has actually contradicted the mean trend and warmed over the same time period: the Bellingshausen Sea

     region.

Modal Perfect
Modal verbs can be used in a variety of different forms. In a perfect tense. Here the modal verb is used to express possibilty or probabality . But since the modal is used totalk about the past, can we use words such as yesterday, last week, and a month ago. 

could have _____ couldn't have _____	past ability
should have ____ shouldn't have ____	You did or didn't do something that was a good idea.
would have ____ wouldn't have _____	past condition / past situation
may have _____ may not have _____	past possibility
might have ______ might not have _____	past possibility

Examples are:
► The boy could have done the dishes himself, but his father decided to help.
► This house of cards would have fallen over if the person who built it hadn't been so careful.
► My grandfather may have used this camera when he was a young man, but I'm not sure.