The semi-compound sentence is a semi-composite sentence built up on the principle of coordination

Coordination

Subordination

Simple

The Structural Types of Sentences.

According to the number of predicative lines (centers):

Composite is formed by two or more predicative lines.

Semi-composite sentence is a sentence with more than one predicative lines which are expressed in fusion. One of these lines can be identified as the leading or dominant, the others making the semi-predicative expansion of the sentence.

The semi-composite sentence displays an intermediary between the composite sentence and the simple sentence:

Its syntagmatic structure is analogous to that of an expanded simple sentence, since it possesses only one completely expressed predicative unit.

Its derivational structure, on the other hand, is analogous to that of the composite sentence, because it is derived from two or more completely expressed predicative units.

There are two different causes of the existence of the semi-com­posite sentence in language. The first cause is the tendency of speech to be economical. The second cause is that the semi-composite sentence fulfills its own purely semantic function, different from the function of the composite sentence.

Simple: one- or two-member

Depending on whether Subject and Predicate are explicitly present in the sentence structure and its type simple sentences fall into:

one-member: nominal (Fire!) and verbal (Do it!)

two-member: complete (When are you going?) and incomplete or elliptical - in which the subject or the predi­cate is contextually omitted (To the cinema.)

We can also define the unexpanded simple sentence as a monopredicative sen­tence formed only by obligatory notional parts. The expanded simple sentence will, accordingly, be defined as a monopredicative sentence which includes, besides the obligatory parts, also some optional parts.

Composite: complex or compound

According to the type of relation btw full predicative lines:

Semi-composite: semi-compound + semi-complex

1. sentences with coordinated subjects positioned so that the first starts the utterance, while the second concludes it

2. sentences with coordination of predicates both verbal and nominal

3. sentences with infinitival phrases expressing a subsequent action of incidental or unexpected character: He woke in his bed to hear a strange hum in the air.

4. sentences with participial phrases expressing a parallel event that serves as a characteristic to the event rendered by the leading clause: He sat staring down the gardens, trying to remember his childhood.

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