41. Thank you for
719
42. Can I + (verb)
677
43. Can I get + (noun)
626
44. I'm not sure if (subject + verb)
753
45. Do you mind if I + (verb)
792
46. I don't know what to + (verb)
634
47. I should have + (Past participle form of verb)
799
48. I wish I could + (verb)
752
49. You should + (verb)
652
50. You're supposed to + (verb)
712