One 、 Grasp the trunk

1.1 How to catch ？

1. Conjunction
   

2. The predicate verb

（ The omission of adverbial clauses ）
The subject is consistent with the subject , The clause predicate verb is be
The subject predicate of the clause can be omitted

Conjunctions （conj） Or prepositions （prep）？

3. Preposition
   In most cases, it is from back to front
   

Two 、 Non backbone structure

2.1 Non backbone ＋ The form of subject predicate object

• The participle structure is actually , The subject of the clause is the same as that of the main clause , Then the verb uses a non finite verb （ing： Take the initiative ）（en： passive ）（to do： Infinitive , future ）
• The independent nominative case is that the subjects of two sentences are inconsistent , Then take a sentence as a clause , Replace the verb with a non finite verb .

2.2 The subject , Non backbone ＋ Predicate object

• In fact, this is , Adverbials appear in the middle of a sentence or are set to modify the subject of a clause or appositive clause .
• Pay attention to nominal clauses , It is very likely to be followed by a definite clause , Nouns in attributive clauses may also be modified , therefore , It is possible to mistake the predicate object of the trunk for , The predicate object of the clause .

2.3 Subject predicate object plus non trunk

• This is After the adverbial clause or The attributive clause or appositive clause modifies the object .