Usage note
好多表示数量很多，或比之前多很多。
hǎo duō biǎo shì shù liàng hěn duō， huò bǐ zhī qián duō hěn duō。
好多 means a lot, or much more than before.
Context note
好多常出现在比较、数量和感叹里。
hǎo duō cháng chū xiàn zài bǐ jiào 、 shù liàng hé gǎn tàn lǐ。
好多 often appears in comparisons, quantity, and exclamations.
5 examples
这里有好多书。
zhè lǐ yǒu hǎo duō shū。
There are a lot of books here.
今天比昨天好多了。
jīn tiān bǐ zuó tiān hǎo duō le。
Today is much better than yesterday.
我有好多朋友。
wǒ yǒu hǎo duō péng yǒu。
I have many friends.
你吃了好多。
nǐ chī le hǎo duō。
You ate a lot.
好多花开了。
hǎo duō huā kāi le。
A lot of flowers have bloomed.
5 mini stories
图书馆里有好多书，我都想看看。
tú shū guǎn lǐ yǒu hǎo duō shū， wǒ dōu xiǎng kàn kàn。
There are so many books in the library that I want to look at them all.
今天的天气比昨天好多了。
jīn tiān de tiān qì bǐ zuó tiān hǎo duō le。
Today's weather is much better than yesterday.
操场上有好多同学在玩。
cāo chǎng shàng yǒu hǎo duō tóng xué zài wán。
There are many classmates playing on the playground.
妈妈说我今天吃了好多饭。
mā ma shuō wǒ jīn tiān chī le hǎo duō fàn。
Mom said I ate a lot of rice today.
春天来了，公园里开了好多花。
chūn tiān lái le， gōng yuán lǐ kāi le hǎo duō huā。
Spring has come, and many flowers have bloomed in the park.
Mini dialogue
好多花
A
你看，花园里有好多花！
Nǐ kàn, huāyuán lǐ yǒu hǎoduō huā!
Look, there are many flowers in the garden!
B
哇，真的好漂亮。
Wa, zhēn de hǎo piàoliang.
Wow, really beautiful.
好多朋友
A
今天学校里有好多人。
Jīntiān xuéxiào lǐ yǒu hǎoduō rén.
There are many people at school today.
B
是啊，我看到了好多朋友。
Shì a, wǒ kàn dào le hǎoduō péngyou.
Yes, I saw many friends.
Related words and contrasts
similar
很多
hěn duō
a lot / many
好多 is more casual and spoken; 很多 is more standard.
opposite
很少
hěn shǎo
very few
很少 means a small amount.