being signed

    sign     

  to have signed   

to sign 

 Having completed the samples’ testing, scientists analyze the

results obtained. 

       .

     .

Scientists completed

the samples’ testing, analyzed the results obtained.

        Completing the samples’ testing, scientists analyze the results obtained. 

       To complete the samples’ testing, scientists analyze the results obtained. 

 The terms and conditions having

revised the collaborations, the scientists were signed an agreement. 

The terms and conditions of collaboration being revised , the scientists signed an

agreement. 

Having revised the terms

and conditions of collaboration, the scientists signed an agreement.

Collaboration and agreement  determine  the

scientists signed an revision of conditions. 

They was considering the complexity of the tasks to reach the

decision   at an early date. 

Considering the

complexity of the tasks the decision was reached at an early date.

 To consider the complexity of the tasks the decision was reached at

an early date. 

  Considering the complexity of the tasks the decision is being reached

at an early date. 

 to know    

 to have been known

 to be known 

know   

The reliable data are not referred to in

this paper. 

The data are not referred to in this reliable paper.

 The data referred to in this

paper are not reliable. 

 To the data to referred in this paper are not reliable. 

once

in

from

out of

on

to, of, in

on, from in

on, of, in

to, from , in

to, of, for

understood  its historic  textures .

understood outside its historic context.

recognized without its historic pretext.

Having discussed the terms

and conditions, the scientists signed an agreement.

Discussing the terms and conditions, the

scientists signed an agreement. 

The terms and conditions being discussed, the scientists signed an

agreement. 

 Having

discussed the terms and conditions, the scientists were signed an agreement.