○○○ jargon ⪢⪢
Again I'm sure you heard a teacher or a grammar book point out that with the third conditional you use if plus the past perfect, plus would or wouldn't have and the past participle. That's a lot of jargon.
http://qindex.info/i.php?x=10013

○○○ site ⪢⪢
We found s perfect _____ for our picnic.
http://qindex.info/i.php?x=14090

○○○ ten ⪢⪢
She's a perfect _____ .
http://qindex.info/i.php?x=30589

• Present Perfect
If the result of the past action continues now, we use present perfect.
http://qindex.info/i.php?x=4140

• Present Perfect
Scientists say they have found evidence of a giant planet in the solar system. There have only been two true planets discovered since ancient times. Planets have been predicted before and then were not found.
http://qindex.info/i.php?x=4149

◌◌◌ Iceland
Why Iceland Offers a Perfect Picture of our Geological Past
http://qindex.info/i.php?x=7310

• 0750± positional notation
By the 8th century, Indian mathematicians had perfected positional notation and over the next several centuries, Arab merchants, scholars and conquerors began to spread it into Europe. -- vigesimal, Maghreb, Hebrew, glyph, Aztecs, duodecimal, sexigesimal
http://qindex.info/i.php?x=4984

• Three Kinds of Verbs - Have
Auxiliary verb Have - perfect sentences
http://qindex.info/i.php?x=4067

• Present Perfect or Past Simple 1
http://qindex.info/i.php?x=4141

• Perfect Aspect
http://qindex.info/i.php?x=4143

• Have and Have Got (Part 1)
As an auxiliary verb, 'have' is used to make perfect tenses. As a full verb, 'have' may mean posession or obligation. #listening
http://qindex.info/i.php?x=4931

• Present Perfect or Past Simple 2
http://qindex.info/i.php?x=4142

• Types of Numbers
a divine perfection, all hell broke loose, survey, taxonomy
http://qindex.info/i.php?x=9547

• perfect place
#level2
http://qindex.info/i.php?x=18234

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