1. Let the common ratio of the geometric sequence $\left\{a_{n}\right\}$ be $t$, and the sum of the first $n$ terms $S_{n}>0(n=1,2,3, \cdots)$, then the range of values for $t$ is $\qquad$.
Obviously, $a_{1}>0$, when $t>0$ it satisfies the condition; when $t0 \Rightarrow t^{n}<1 \Rightarrow -1<t<0$. Therefore, the range of $t$ is $(-1,0) \bigcup(0,+\infty)$.