31. Traditionally, the bark is the principal part of the plant used medicinally, although Primorskiy regions of Russia. 32. It also contained the first complete exposition of the algebraic approach to differential calculus, via principal parts . 33. "I usually don't know the corps or the soloist parts, but I always know the principal parts . 34. Its building history covers 450 years, but the principal parts of the buildings are in Baroque style. 35. The article on the hapless staffer has been deleted, which was a principal part of the request. 36. An example verb of each class is shown here, using different forms to demonstrate different principal parts . 37. A principal part of the officers'duties in Hong Kong, Pentagon officials said, was monitoring foreign military activity. 38. Although Babcock would not confirm it, Philadelphia is believed to be a principal part of the negotiations. 39. The past third-person plural is used for the third principal part , and the past participle for the fourth. 40. In the first case the accompaniment is subordinate, and serves merely to support the first or principal part .
