either of them

both of them

neither of them

each of them

Although (conj)

Because (conj)

Despite (prep)

Instead of (prep)

since

when

for

until

shall we

do we

don’t we

will we

^{A new supermarket has just been opening in our town.}

^{A new supermarket was opened our town.}

^{A new supermarket had just been opened in our town.}

^{A new supermarket has just been opened in our town.}

^{If I am free tonight, I will go to the party.}

^{Unless I were busy, I would go to the party.}

^{If I were free tonight, I could go to the party.}

^{D. If I were busy, I would not go to the party.}

^{The man whom we met this morning is my uncle.}

^{The man whom we had met this morning was my uncle.}

^{The man is my uncle, whom we met this morning.}

^{The man with whom we met this morning is my uncle.}

^{Nam asked me where I lived with my parents.}

^{Nam asked me in which I that flat with my parents.}

^{Nam asked me if or not I lived in that flat with my parents.}

^{Nam asked me whether I lived in that flat with my parents.}

^{We take you to Da Lat where you can enjoy pure air there.}

^{We take you up Da Lat where you can enjoy pure air in.}

^{We take you to Da Lat where you can enjoy pure air.}

^{We take you up Da Lat where you can enjoy pure air.}