Such sentences are ‘complex’. The attribute precedes in ‘So | I can’t go; In that case | I can’t go; If that is true | I can’t go; Unless he says it’s all right, | I won’t’. When an attribute follows, it is often difficult to tell whether it is attributive to all that precedes or just to the second IC of the predicative construction. If our analysis is correct in the following, they are complex sentences: ‘He is coming | if you will let him; He is coming | if possible; He’ll go | if he wants to’.
- Hockett (1958), Pag. 200