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Tensed and non- tense Clause and Voice constraints

Tensed and non- tense Clause and Voice constraints

Please, can any body help me by giving me a simple defination and analytical description on the following:
1. What is tensed and non-tense Clause? Define and Describe.
2.What is meant by voice constraint? Define aand describ with example
I will be grateful if anybody post the answer at the following address:
biplabb-biswas@yahoo.com