The Complete Guide to the TOEFL TEST passage4 문법정리
Until the late 1700`s, metal could not be turned on a lathe
(to make it uniformly smooth and round)
☞사역동사 make † 목적어† 목적보어(make it smoothly는 틀린표현. 목적보어자리에 부사가 올수 없으며 형용사가 와야 함.)
because a machinist could not guide the cutting tool evenly (by hand against the turning piece). This problem was solved by the toolmaker David Wilkinson (of Pawtucket, Rhode Island).
☞수동태문장 ‘~에 의해 해결되었다’
In 1798 he invented a machine tool in which the cutter was clamped onto a moveable slide
☞전치사in † 관계대명사 which = 관계부사(where, what, when..등등)가 됨.
(that could be advanced precisely, by hand crank, parallel to the work).
☞주어that † 동사could be advanced † 형용사parallel = 2형식 문장
The slide rest lathe, (as it came to be called,) allowed the machinist to turn large pieces of metal very quickly and precisely.
☞allow † 목적어 † to 동사원형 : 목적어가 ~하게 함을 허락하다