Perfect Modal Verbs </SPAN>
modal verb + have + past participle
Perfect Modal </STRONG></SPAN>
</STRONG>
Picture</STRONG></SPAN>
sentence</STRONG></SPAN>
could have
couldn't have
past ability
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
The boy could have done</STRONG> the dishes himself, but his father decided to help. </SPAN>
should have
shouldn't have
You did or didn't do something that was a good idea. </SPAN>
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
The girl shouldn't have spun</STRONG> around so many times. She fell down.
spin: turn around many times.
spin / spun / spun
would have
wouldn't have
past condition /
past situation
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
This house of cards would have fallen</STRONG> over if the person who built it hadn't been so careful. </SPAN>
may have
may not have
past possibility
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
My grandfather may have used</STRONG> this camera when he was a young man, but I'm not sure. </SPAN>
might have
might not have
past possibility
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
Her mother might have put</STRONG> mustard on her sandwich. She hopes not. </SPAN>
must have
must not have
past probability
This indicates that something probably happened in the past
نقره لتكبير أو تصغير الصورة ونقرتين لعرض الصورة في صفحة مستقلة بحجمها الطبيعي
They must have practiced </STRONG>a lot because they're very good musicians. </SPAN>

Let's not forget
The Future Perfect Tense
Unlike all the other modals above, will is used for the future:
Subject + will + have + past participle
Singular</SPAN>
Plural
I will have lived </SPAN>
We will have lived </STRONG>
You will have lived </SPAN>
You will have lived </STRONG>
He will have lived </SPAN>
</SPAN>
She will have lived </SPAN>
They will have lived </STRONG>
It will have lived </SPAN>
</SPAN>
This is a difficult tense to use. It describes an action that will be completed in the future
For example
I moved to Minnesota in 1991. The year now is 2008
By 2011, I will have lived in Minnesota for 20 years