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Variational calculations for s-shell hypernuclei are performed by explicitly including Σ degrees of freedom. Two sets of YN interactions (D2 and SC97e(S)) are used. The bound-state solution of [sup 5, sub Λ]He is obtained by using each of YN potentials, and a large energy expectation value of the tensor ΛN - ΣN transition part is found by using the SC97e(S). The internal energy of [sup 4]He subsystem changes a lot by the presence of a A particle with the strong tensor ΛN - ΣN transition potential. [ABSTRACT FROM AUTHOR]