Question

Перепишите следующие предложени, определите в них видоизмененные формы глаголов и укажите их ининитив
1, The story how D.I.Mendeleev established the Periodic System of elements has long been a matter of great interest to research workers
2. When mendeleev began to teach at St.petersburg university,chemistry was still far from being the well-ordered and harmonious of science that we know today
3.Mendeleev`s table developed into modern Periodic table one of the most important tools in chemistry
4.That matter may exist in three physical states (solid,liguid and gas) is common knowledge
5. Solids have both a definite volume and a definite shape
6. Water dissolves a very large number of substances and is the most important solvent
7. After they had found the composition of water, the scientists could investigate its properties
8. Astronomers have found that the same elements which are common on the Earth,e.g.nitrogen,carbon and hydrogen,are also the commonest in the sun and other stars
9. Every substance has physical and chemical properties
10. Scientists believe that the atmosphere has changed a very great deal since the Earth was first formed

Answer 1

1, established (past simp - establish), has been (pers perf - be)
2. began (past simp - begin) was (past simp - be), know (pres simp - know)
3. developed  (past simp - develop)
4. may (pres simp - may), exist (infinitive - exist), is (pres simp - be)
5. have (pres simp - have)
6. dissolves (pres simp - dissolve), is (pres simp - be)
7. had found (past perf - find), could (past simp - can), investigate (infinitive - investigate)
8. have found (pres perf - find), are (pres simp - be), are (pres simp - be)
9. has (pres simp - have)
10. believe  (pres simp - believe), has changed (pres perf - change), was (past simp - be)