Hi
This is with rference to Page 111 , in Sentence Correction STRATEGY Guide.
it says that the THe usual sequence are EITHER , PRESENT + FUTURE OR PAST + CONDITIONAL
THEN the LAST Example given is:
WRONG:: The scientist BELIEVED that the machine WOULD BE wonderful.
............................... past................................future
is the above right or wrong ?
If it is right then ::
"would have" is reserved for sentences that describe the hypothetical alternate outcome of some past event. you use the past perfect in the hypothesis, and "would have" in the consequent.
if she had told me about the traffic delays, i would have left home earlier.
(note: this is a form that most native speakers will SAY incorrectly; most native speakers will incorrectly use "would have" in BOTH parts of this sentence.)