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ground was firm enough and would not sink, if it were stepped on, walked




Across or put heavy weight upon.

It would have been impossible to launch space rockets, if we had not had the

Necessary polymeric materials and synthetic fuels.

IV. .

THE ORBITAL STATIONS OF THE FUTURE

Long-term orbital research stations are very useful to scientists today for weather forecasting, agriculture, geology, sea and air transport and for protecting the environment.

A modern long-term orbital station is a research laboratory in space, where the researches can be done that are quite unconceivable on Earth.

Take physics. Because there is no atmosphere in space, physicists can study cosmic rays, carry out experiments that may help discover new nuclear reactions and elementary particles.

Then, too, in weightlessness we could get purer materials. When molten metal cools off on the Earth, the density will always be slightly uneven because the surrounding temperature is uneven while gravity upsets the structural balance by distorting the crystallization leaving us with an imperfect end product. In space these problems are avoided, there is no gravity and no atmosphere, so the quality of crystals is sharply improved.

5. The crystals grown in weightlessness are extra pure substances which can be used for semiconductors, lasers, computer engineering and in medicine. There will be space observatories too the research is already under way. From orbit one can watch the development of cyclones and typhoons, predict when they will strike and give an advance warning.

 

1

Ist form IInd form IIId form Lexical
Infinitive Past Indefinite Past Participle Meaning
TO AWAKE AWOKE AWOKE
AWAKED AWAKED
TO BE WAS, WERE BEEN ,
TO BECOME BECAME BECOME
TO BEGIN BEGAN BEGUN
TO BLOW BLEW BLOWN
TO BREAK BROKE BROKEN ,
TO BRING BROUGHT BROUGHT
TO BUILD BUILT BUILT
TO BURN BURNT BURNT
TO BURST BURST BURST ()
TO BUY BOUGHT BOUGHT
TO CATCH CAUGHT CAUGHT ,
TO CHOOSE CHOSE CHOSEN
TO COME CAME COME
TO COST COST COST
TO CUT CUT CUT ,
TO DO DID DONE
TO DRAW DREW DRAWN ,
TO DREAM DREAMT DREAMT ,
DREAMED DREAMED
TO DRINK DRANK DRUNK
TO DRIVE DROVE DRIVEN , ,
TO EAT ATE EATEN ,
TO FALL FELL FALLEN
TO FEEL FELT FELT
TO FIND FOUND FOUND ,
TO FLY FLEW FLOWN
TO FORGET FORGOT FORGOTTEN
TO FREEZE FROZE FROZEN
TO GET GOT GOT ,
TO GIVE GAVE GIVEN
TO GO WENT GONE ,
TO GROW GREW GROWN
TO HANG HUNG HUNG ,
TO HAVE HAD HAD
TO HEAR HEARD HEARD
TO HOLD HELD HELD
TO HURT HURT HURT
TO KEEP KEPT KEPT ,
TO KNIT KNIT KNIT  
KNITTED KNITTED
TO KNOW KNEW KNOWN
TO LAY LAID LAID ,
TO LEAD LED LED ,
TO LEAN LEANT LEANT ()
LEANED LEANED
TO LEARN LEARNT LEARNT ,
LEARNED LEARNED
TO LEAVE LEFT LEFT , ,
TO LET LET LET ,
TO LIE LAY LAIN
TO LOSE LOST LOST
TO MAKE MADE MADE ,
TO MEAN MEANT MEANT ,
TO MEET MET MET ()
TO PUT PUT PUT ,
TO READ READ READ
TO RIDE RODE RIDDEN , …
TO RING RANG RUNG ,
TO RISE ROSE RISEN
TO RUN RAN RUN
TO SAY SAID SAID ,
TO SEE SAW SEEN ,
TO SELL SOLD SOLD
TO SEND SENT SENT
TO SET SET SET , ,
TO SEW SEWED SEWED
SEWN
TO SHAKE SHOOK SHAKEN ()
TO SHAVE SHAVED SHAVED ().
SHAVEN
TO SHINE SHONE SHONE ()
TO SHOOT SHOT SHOT
TO SHOW SHOWED SHOWED
SHOWN
TO SHUT SHUT SHUT
TO SING SANG SUNG
TO SIT SAT SAT
TO SLEEP SLEPT SLEPT
TO SPEAK SPOKE SPOKEN ,
TO SPELL SPELT SPELT
SPELLED SPELLED
TO SPEND SPENT SPENT ,
TO SPREAD SPREAD SPREAD , ()
TO STAND STOOD STOOD
TO STEAL STOLE STOLEN
TO STRIKE STRUCK STRUCK ,
TO SWEEP SWEPT SWEPT
TO SWIM SWAM SWUM
TO TAKE TOOK TAKEN ,
TO TEACH TAUGHT TAUGHT ,
TO TEAR TORE TORN
TO TELL TOLD TOLD ,
TO THINK THOUGHT. THOUGHT ,
TO THROW THREW THROWN
TO UNDERSTAND UNDERSTOOD UNDERSTOOD
TO WAKE WOKE WOKEN
WAKED WAKED
TO WEAR WORE WORN
TO WIN WON WON ,
TO WIND   WOUND WOUND ()
TO WRITE WROTE WRITTEN

 


2

.

Active Passive

() ()

I. I n d e f i n i t e
V(s) He writes 1. Present To be +V(ed) (PII) He is written ( )
V(ed) He wrote 2. Past To be +V(ed) (PII) He was written ( )
Shall/will V He will write 3. Future Shall/will + be +V(ed) (PII) He will be written
II. C O N T I N U O U S
To be +V(ing) P.I. He is writing () 1. Present To be + being +V (ed) (P.II.) He is being written (, )
To be + V(ing) P.I.   He was writing ( ) 2. Past To be + being + V(ed) (P.II.) He was being written ( )
Shall/will be + V(ing) P.I. He will be writing ( ) 3. Future
III. P E R F EC T
Have (has)+ V(ed) (P.II.) He has written ( ) 1. Present Have (has) +been + V(ed) (P.II.) He has been written. ( )
Had + V(ed) (P.II.) He had written ( ) 2. Past Had + been + V (ed) (P.II.) He had been written. ( )
Shall/will + have + V(ed) (P.II.) He will have written ( ) 3. Future Shall/will + have + been + V(ed) (P.II.) He will have been written. ( )

 


.

1. .. - . . , 1999.

2. .., .. - . . , 2001.

3. .. - . . , 1982.

4. .. II - . . , 1981.

5. .. . . , 1998.

ARROYD T.N.W. Concrete. Properties and Manufacture. Oxford. Pergamon Press, 1962





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