  Let $U_q(\frak{g})$ a the quantum affine algebra of type $A_n^{(1)}$,
$A_{2n-1}^{(2)}$, $A_{2n}^{(2)}$, $B_n^{(1)}$, $D_n^{(1)}$ and $D_{n+1}^{(2)}$,
and let $\mathcal{F}(\Lambda)$ be the Fock space representation for a level 1
dominant integral weight $\Lambda$. Using the crystal basis of
$\mathcal{F}(\Lambda)$ and its characterization in terms of abacus, we
construct an explicit bijection between the set of weight vectors in
$\mathcal{F}(\Lambda)_{\lambda-m\delta}$ ($m\geq 0$) for a maximal weight
$\lambda$ and the set of certain ordered sequences of partitions. As a
corollary, we obtain the string function of the basic representation
$V(\Lambda)$.
