This is 和big ship 之间必须带a吗？ this is a big ship,改为否定句怎么改？

this is big ben\u4e3a\u4ec0\u4e48\u4e0d\u52a0a\u6216the

big
ben\u662f\u7279\u6307\uff0c\u6240\u4ee5\u4e0d\u80fd\u662fa
\u8bed\u6cd5\u4e0a,big
ben\u662f\u4e13\u6709\u540d\u8bcd,\u5e94\u8be5\u52a0the,\u4f46\u6709\u4e9b\u65f6\u5019\u4e0d\u52a0,\u4e5f\u4e0d\u9519,big
ben\u662f\u5916\u56fd\u4eba\u8033\u719f\u80fd\u8be6\u7684,\u4e0d\u52a0the,\u8868\u793a\u719f\u6089

\u5426\u5b9a\u53e5\u662f\uff1a
This isn't a big ship.
\u6709\u7cfb\u52a8\u8bcdam\uff0cis\uff0care\u7684\u5426\u5b9a\u53e5\u662f\u5728\u5b83\u4eec\u540e\u9762\u52a0not\uff0c am not \uff0cis not\u548care not\u7f29\u5199\u662fisn't aren't

因为ship是单数可数名词，所以要加a

你好，因为ship是单数可数名词，所以必须要加上不定冠词a。
望采纳。