1、"enough…to"的固定句式
[例句] "While we know how to tell a robot to handle a specific error," says Dave Lavery, manager of a robotics program at NASA," we can't yet give a robot enough 'commonsense' to reliably interact with a dynamic world."
2、"it occurs to sb. that..."的固定句式
[例句] When I decided to quit my full time employment it never occurred to me that I might become a part of a new international trend.
[譯文] 當我決定辭去全日制工作的時候，我未曾想到我會成為一種新的國際流行趨勢的一部分。
3、插入語
[例句] But, for a small group of students, professional training might be the way to go sincewell-developed skills, all other factors being equal, can be the difference between having a job and not.
[譯文] 但是對于一小部分學生來說，職業訓練也許是可取的方式，因為在其他因素同等的情況下，熟練的技術可以在得到或失去工作之間起到作用。
4、"it is time that…"的固定句式
[例句] It is time that the world learned the lessons of Aswan.
5、"on the grounds that..."的固定句式
[例句] Railroads justify rate discrimination against captive shippers on the grounds that in the long run it reduces everyone's cost.
6、"it isn't clear that..."的固定句式
[例句] While warnings are often appropriate and necessary - the dangers of drug interactions, for example - and many are required by state or federal regulations, it isn't clear that they actually protect the manufacturers and sellers from liability if a customer is injured.