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6. -> Mom said that her friend had invited her to a wedding ceremony so she would have to buy a new dress the following day.

Giải thích:

Chuyển : my friend=>her friend

                invited=> had invited (QKD=>QKHT)

                me=>her

                I'll=I will (will=>would)

                tomorrow=> the following day/the next day

7. -> Mr.Thomas always says that his children were well-behaved.

Giải thích:

Chuyển: my children=>his children

               are=>were (HTD=>QKD)

8. -> The twin sisters said that that was their family's photo ten years before.

Giải thích:

Chuyển: this=>that

               is=>was (HTD=>QKD)

               our family's=>their family's

               ago=>before