The past participle of "complete" is "completed." It is used in perfect tenses and passive voice constructions, for example, "The project has been completed."
The past participle of "keep" is "kept." It is used in perfect tenses, such as "have kept" or "had kept."
When a positively charged particle is launched past a fixed negatively charged particle, it will experience an attractive force due to the electrostatic interaction between the opposite charges. As a result, the positively charged particle will accelerate towards the negatively charged particle, following a curved trajectory that bends towards it. Depending on the initial velocity and angle of launch, the particle could either spiral in towards the negatively charged particle or pass by it with a deflected path, influenced by the strength of the attraction and its initial momentum.
Light is currently considered to be the fastest known particle(s) in existence. There are theoretical particles that can function well past the speed of light. One example of such theoretical particle is the Tachyon.
The past participle of "show" is "shown." It is used in perfect tenses, such as in the sentence "She has shown great talent." Another form, "showed," is the simple past tense.
The amount of time for one particle of the medium to make one complete vibration cycle is known as the period of the wave. It is the time it takes for a wave to repeat its motion.
Past is : Beat (itself) Past Particle : Beaten
The past participle of 'break' is 'broken'. The simple past tense is 'broke'.
The simple past and past participle is had.
"Encouraged" is the simple past and past participle of the verb "encourage".
The past participle for shrink is shrunk.shrink / shrank / shrunk
The past participle of do is 'done'.
The past participle is burst.
The past participle is drawn.
The past participle (and simple past) is loved.
Been
infinitive: be past: was/were past participle: been
The past tense is took. The past participle is taken.