=>
26. My grandmother used to grow sunflowers but she doesn't any more.
-> used to V : đã từng
27. Although she had not finished the report, she went to sleep.
-> although S V : mặc dù
28. In spite of the muddy roads, the children walk to school.
-> in spite of N/Ving : mặc dù
37. She will be invited to my birthday party tomorrow.
-> bị động TLĐ will be V3/ed
38. America has less population than China.
-> less...than : ít...hơn